Waterway Inc. uses a perpetual inventory system. At January 1, 2020, inventory was $211,257,900 at both cost and realizable value. At December 31, 2020, the inventory was $286,249,300 at cost and $262,969,900 at realizable value. Prepare the necessary December 31 entry under (a) the cost-of-goods-sold method (b) Loss method.