please use prepetual accouting method

Cost Formulas for Inventory Stocks, Inc., sells weight-lifting equipment. The sales and inventory records of the company for January through March 2017 were as follows: Weight Sets Unit Cost Total Cost NT$30 32 NT$13,800 3,520 460 110 216 105 307 36 Beginning inventory, January 1 Purchase, January 16 Sale, January 25 (NT$45 per set). Purchase, February 16 Sale, February 27 (NT$40 per set) Purchase, March 10 Sale, March 30 (NT$50 per set). 3,780 150 28 4,200 190 Required: 1. Determine the amounts for ending inventory, cost of goods sold, and gross margin under the following cost formulas. Use the periodic inventory system, which means that all sales are assumed to occur at the end of the period no matter when they actually occurred. Round amounts to the nearest dollar. FIFO b. Weighted average cost 2. Interpretive Question: Which cost formula results in the highest gross margin? Why? a