[1] Defendant first contends that the trial court erred in allowing plaintiffs witness John Sumner to testify on direct, and the defendant’s witness George Hodges to testify on cross-examination, about a negotiation for the purchase by defendant of two used trucks from Brockway. According to the testimony, Hodges suggested that when the financing for the purchase of the trucks was being arranged, that Sumner raise the price of each of the trucks by $2,000 and apply the extra $4,000 from the sale against the repair bill for the Kenworth truck. Defendant contends that this negotiation occurred subsequent to the events alleged by plaintiff to have created a contract between the parties for repairs to the Kenworth truck, and thus it was irrelevant and prejudicial. Defendant further contends that it should be excluded as an offer to compromise.
We think this evidence was relevant and was admissible as an admission of a party. “Anything that a party to the action has done, said or written, if relevant to the issues and not subject to some specific exclusionary statute or rule, is admissible against him as an admission.” 2 Stansbury’s N.C. Evidence § 167, at 4 (Brandis rev. 1973); State v. Gaines, 283 N.C. 33, 194 S.E. 2d 839 (1973). Such a statement is admissible if “it can reasonably be interpreted as an acknowledgment of the existence of a relevant fact.” Stansbury, supra § 167, at 9-10. This testimony establishes an admission by Hodges that, at the time he made the statements, he considered himself liable for the debt involved in the present case. The discussion of the proposed method of payment assumed the existence of the debt, and was clearly relevant. Furthermore, .the testimony was not excludable as an offer to compromise. The amount of the repair bill was $4,025.71; it would be unrealistic to assume that an offer to pay $4,000 was a compromise offer. This assignment of error has no merit.
Defendant next contends that the court erred in failing to grant his motions for a directed verdict and for a judgment notwithstanding the verdict. Defendant advances three arguments in support of this contention: (1) that there was insufficient evidence of a contract between Brockway and the defendant; (2) that, at most, the evidence might show a promise by defendant to pay the debt of Billy Lee, and such a promise is unenforceable under G.S. *121§ 22-1 since it was not in writing; and (3) that, insofar as the contract related to goods sold, it was barred by G.S. § 25-2-201.
[2] Plaintiff introduced evidence tending to show that the defendant’s president, George Hodges, telephoned John Sumner at Brockway, and told him that the truck was being towed in, that his business was flourishing and “he needed the truck repaired as quickly as he could get it back on the road.” After the repairs had been completed, Hodges told Sumner that he would pay for the repairs, and even instructed him as to where to send the bill. Subsequent to 21 October 1974, Hodges discussed paying for the repairs with Thomas Dunn, business manager for Brockway, approximately fifteen to twenty times. Hodges told Dunn that he was going to pay the bill as soon as he could. We think that this evidence, when viewed in the light most favorable to the plaintiff, was sufficient to show the existence of a contract between the defendant and Brockway for the repair of the truck.
[3] With regard to the defendant’s second argument, there was no evidence that Billy Lee ever entered into a contract with Brockway for the repair of his truck. The evidence discloses that Lee never had any discussions with Brockway concerning the repairs to the tractor, he never promised to pay for the repairs, and he was never billed for the repairs by Brockway. The evidence further discloses that the defendant contracted directly with Brockway for the repairs of the truck, and that no debt ever existed between Brockway and Lee for which defendant could be considered a guarantor of payment. Thus, the promise of defendant to pay for the repairs is not barred by G.S. § 22-1 as being an unwritten promise to pay the debt of another, since the evidence disclosed that the bill he promised to pay was the defendant’s and not the debt of another.
[4] We also reject defendant’s argument that any contract for the parts used in the repair of the truck is rendered unenforceable by the statute of frauds provision of G.S. § 25-2-201 pertaining to the sale of goods. By its express terms, G.S. § 25-2-201 applies only to a contract for the sale of goods. In the present case, the contract was one for services rendered in the repair of a truck. The fact that various parts are also required to properly repair and service the truck is merely incidental to the repair contract, and does not bar its enforcement, either in its entirety or to the extent of the cost of the parts included.
*122 [5] By assignments of error numbers five and six, defendant contends that the court erred in allowing plaintiff to introduce into evidence a duplicate invoice from Brockway that had some handwritten notations on it, and that the judge’s comment to the jury to examine the exhibit carefully constituted an unpermitt'ed expression of opinion as to its weight. Defendant argues that the exhibit was inadmissible on two grounds: (1) the handwritten notations were never properly authenticated, and (2) in any event the inscriptions on the invoice were hearsay and thus incompetent.
Plaintiffs evidence tended to show that the duplicate invoice was sent to George Hodges at Harnett Transfer, and that the handwritten notations were not put on the document by anyone at Brockway. The handwritten notations on the bill are as follows:
Pd Interest on bill 7-14-75 $97.49
Ck # 9496
4025.71
Pd by ck 8934 1475.50
Bal due 2550.21 To Brockway Motor Trucks
Billy Lee testified that this invoice was sent to him in a Harnett Transfer, Inc., envelope, and that the handwriting was on the invoice when he received it. Lee further testified that he was familiar with the handwriting of Mrs. Hollis, who did all of Harnett’s settlement statements, that he had seen her handwriting on a number of occasions, and that in his opinion the handwriting on the invoice was hers.
In North Carolina, a witness “who has acquired knowledge and formed an opinion as to the character of a person’s handwriting . . . from having, in the ordinary course of business, seen writings purporting to be his and which he has acknowledged or upon which he has acted or been charged . . . may give such opinion in evidence.” 2 Stansbury’s N.C. Evidence § 197, at 121-22 (Brandis rev. 1973). We think that Lee’s testimony in the present case falls squarely within the above-quoted rule, and thus the writing was sufficiently authenticated.
Furthermore, the handwriting on the invoice did not render the exhibit inadmissible on the basis of hearsay. Hearsay is an out-of-court statement, either oral or written, that is offered into *123evidence for the purpose of proving the truth of the matter asserted therein. Bullock v. Insurance Co. of North America, 39 N.C. App. 386, 250 S.E. 2d 732 (1979). In the present case, it is clear that the handwriting was not offered to prove the truth of the matter asserted therein, viz., that the amounts written had been paid. Indeed, all the evidence tended to show that Brockway had not received any payments for the repairs. The invoice was offered only for the purpose of showing that the statements had been made. A permissible inference from the notations was that defendant considered itself liable for the account; nevertheless, the admission of the invoice was proper.
[6] Defendant also contends that the trial judge made an improper comment on the evidence with regard to the invoice when he made the following statements to the jury: “Ladies and gentlemen, you have been handed plaintiffs Exhibit 2. Each of you may examine it to the extent that you feel appropriate and necessary. Examine it very carefully.” Under G.S. § 1A-1, Rule 51(a), the trial judge is expressly forbidden to convey to the jury, in any manner, at any stage of the trial, his opinion as to the importance or credibility of any of the evidence. Searcy v. Justice, 20 N.C. App. 559, 202 S.E. 2d 314 (1974). We do not think, however, that the judge’s instruction to the jury to examine the exhibit “very carefully” when considered contextually, constituted an improper comment as to the probative force of the evidence.
[7] Defendant’s remaining assignments of error all relate to the judge’s instructions and to the issues submitted to the jury. The thrust of defendant’s argument is that the evidence does not establish the existence of a contract between Brockway and the defendant or any agreement to pay a specific price for the repairs to the truck. Thus, defendant argues, the trial judge erred by (1) instructing the jury only as to express contracts and not instructing or submitting an issue on a quantum meruit theory of recovery, and (2) giving a “peremptory instruction” on the amount of damages rather than instructing and submitting an issue that plaintiff is entitled to recover only what the services are reasonably worth. Defendant cites Pilot Freight Carriers, Inc. v. David G. Allen Co., Inc., 22 N.C. App. 442, 206 S.E. 2d 750 (1974), in support of its argument.
*124We think the defendant’s contentions are without merit. In the Pilot Freight Carriers case, the evidence disclosed that the plaintiff had shipped crushed stone which was subsequently used by the defendant in the construction of a turkey plant. In upholding a summary judgment for plaintiff on the issue of liability, we said:
[N]o express contract existed between the parties. These un-controverted facts manifest a benefit conferred by plaintiff and an acceptance of such benefit by the defendant. Such circumstances dictate, in the absence of an express contract, that quasi-contract principles be imposed to prevent one party from being unjustly enriched to the detriment of the other.
22 N.C. App. at 444, 206 S.E. 2d at 752.
In contrast, the evidence in the present case tends to show that Hodges specifically telephoned Brockway and requested that the truck be repaired; that after the truck was repaired, Hodges instructed Brockway to send the bill to him; that he informed Sumner that he would pay for the repairs, and “that as soon as the truck got back on the road he would take care of the bill . . . just as quickly as he could.” The only issue raised by this evidence is whether the parties entered into a contract for the repair of the truck. It does not raise the issue whether the plaintiff is entitled to recover on a theory of quantum meruit.
Defendant further challenges the following instruction to the jury with regard to the issue of damages: “Again with respect to this Issue, all the evidence indicates and tends to show that the costs of labor and materials was $4,025.71. If you believe this evidence, it would be your duty to answer this Issue in the sum of $4,025.71.”
Defendant argues that the above-quoted portion of the charge amounts to a “peremptory instruction” on the issue of damages, and that there is no evidence that the defendant ever agreed to pay a specific amount. There is evidence in the record tending to show that the amount billed to defendant for the repairs was $4,025.71, and the invoice was even introduced into evidence. Thomas Dunn, who was employed by Brockway as business manager at the time the transactions giving rise to this case arose, testified as follows:
*125... I talked to Mr. Hodges on the phone several times, and when he would come into the office, I would talk to him about his account. On these occasions I would always ask him when he was going to pay the bill, and he said he would pay it as soon as he could, that he was going to take care of it, there was no question about it. I discussed the size of the bill with him a lot of times, and he said that it was his bill and he would see that it was paid. I discussed this particular Harnett Transfer, Inc. account with him 15 or 20 times after October 21, 1974.
This evidence is sufficient to support the challenged instruction.
We hold that the evidence adduced at trial supports the judge’s instructions and the issues submitted and is also sufficient to support the verdict and judgment for plaintiff.
No error.
Chief Judge MORRIS and Judge WEBB concur.