During January, a company that uses a perpetual inventory system had beginning inventory, purchases, and sales as follows (14 marks): Cost per unit 12 Begin Inventory Sale Purchase Jan 5 10 15 25 Units 100 50 70 25 35 Sale Sale 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. Compute gross profit under for a and b