During January, a company that uses a perpetual inventory system had beginning inventory, purchases, and sales as follows (14 marks): Cost per unit Units 100 50 Jan 5 Begin Inventory Sale Purchase Sale Sale 25 25 Required: 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. C. Compute gross profit under for a and b