During January, a company that uses a perpetual inventory system had beginning inventory purchases, and sales as follows (14 marks): Cost per unit Jan S Begin Inventory Sale Purchase Sale Sale Units 100 50 70 25 35 25 Required: a. b. C. Prepare a schedule showing cost of goods sold and ending inventory using weighted average. Prepare a schedule showing cost of goods sold and ending inventory using First In First Out. Compute gross profit under for a and b