If any mistake were made, it was an honest one, for which the defendant is responsible as principal. See Penna. R.R. Co. v. Minis, 120 Md. 496, 502, 503, 505; Matthews v. Headley Chocolate Co., 130 Md. 523, 535; Foutz v. Miller, 112 Md. 458, 461. It follows that the defendant has not met the burden of proving fraud on the part of its general manager in the making of the contracts in question nor that the contracts were unconscionable in their terms.