单选题
Restrone Inc. sells computer mainboard. At year-end, due to a sudden increase in manufacturing costs, the replacement cost per set of mainboard is $73. The history cost is $56, and the current selling price is $68. The normal profit margin is 15% of the selling price, and the selling costs are $4 per set. According to U.S. GAAP, which of the following amounts should each set of mainboard on Restrone"s year-end balance sheet?