Please, help with Periodic Inventory by Three methods.

Periodic inventory by three methods Dymac Appliances uses the periodic inventory system. Details regarding the inventory of appliances at January 1 , purchases invoices during the next 12 months, and the inventory count at December 31 are summarized as follows: Required: 1. Determine the cost of the inventory on December 31 by the first-in, first-aut-method. If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the units PURCHASED MOST RECENTLY first. 1. Determine the cost of the inventory on December 31 by the first-in, first-out method. If the inveritory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the units PURCHASED MOST RECENTLY first. Cost af the Inventory-FIFO Method 2. Determine the cost of the inventory on December 31 by the last-in, first-but method, If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the OLDEST units fitst. Dymac Appliances December 31 Dymac Appliances Cost of the Inventory-Weighted Average Method 4a. Which inventory method would be preferred for income tax purposes in periods of nising prices? 4b. Which inventory method would be preterred for income tax purposes in periods of decining prices