Question 4 (8 marks) Bianca has the following inventory, purchases, and sales data for the month of March. The physical inventory count on March 31 shows 500 units on hand. Inventory: March 1 200 units @ $4.00 $ 800 Purchases: March 10 500 units @ $4.50 2,250 March 20 400 units @ $4.75 1,900 March 30 300 units @ $5.00 1,500 Sales: March 15 500 units March 25 400 units Required: 1. Under a periodic inventory system, determine the cost of inventory on hand at March 31 and the cost of goods sold for March under (a) FIFO and (b) average-cost. 2. Under a perpetual inventory system, determine the cost of inventory on hand at March 31 and the cost of goods sold for March under (a) FIFO and (b) average-cost