American Sand & Gravel, Inc., agreed to sell sand to Clark at a special discount if 20,000 to 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 Sand & Gravel. Clark refuses to pay more than $0.45 per ton. American Sand & Gravel sues for the remaining $0.10 per ton. Decision?