American Sand & Gravel agreed to sell sand to Clark at a special discount rate if 20,000-25,000 tons were ordered. The discount price was $0.45 per ton, compared with the normal price of $0.55 per ton. Two years later, Clark orders and receives 1,600 tons of sand from American. Clark refuses to pay more than $0.45 per ton.American sues for the remaining $0.10 per ton. What result?