In exchange for legal services rendered to her by the law firm of Westmoreland, Hall, and Bryan, Barbara Hall wrote the following letter: “I agree to pay to your firm as attorney’s fees for representing me in obtaining property settlement agreement and tax advice, the sum of $2,760, payable at the rate of $230 per month for twelve (12) months beginning January 1, 1970. Very truly yours, Barbara Hall Hodge.” Was the letter a negotiable instrument? Give the reason for your answer. Hall v. Westmoreland, Hall & Bryan, 182 S.E.2d 539 (GA).