Please explain the equations for each step.

Kingbird, Inc. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales. Purchases Date Units Unit Cost Sales Units 9 $111 7 12 $127 July 1 July 6 July 11 July 14 July 21 July 27 5 14 $138 11 Average cost for each unit July 1 $ 111 July 6 $ 111 July 11 $ 124.714 July 14 $ 124.714 July 21 $ 132.8 July 27 $ 132.8 Determine the ending inventory under a perpetual inventory system using (1) FIFO, (2) moving-average cost, and (3) LIFO. (Round average-cost per unit to 3 decimal places, e.g. 12.521 and final answer to O decimal places, e.g. 1,250.) FIFO MOVING-AVERAGE LIFO The ending inventory under a perpetual inventory system $ $ $