Calculate the unit price of sold merchandise during the month of September

Compared with FIFO,LILO, and Average cost, Which inventory cost assumption will result in the lowest tax expenses for Giants Ltd?

1. Giants Ltd uses the periodic inventory system and the physical count at 30 September indicates that 40 units of inventory are remaining on hand. 2. Sales revenue for September totalled $25,000. 3. Giant Ltd has not changed the price of selling merchandises during the month of September. The firm does not provide any trade discounts to their customers as well