Stanley Ltd began 1 March 2022 with 80 units of sunglass inventory that cost $25 each. During the month, Stanley Ltd completed the following transactions: Required: Units Unit cost Unit sale price Mar 7 Sale 55 10 Purchase 90 $50 23 Sale 70 31 Purchase 35 $55 $75 $75 (i) Prepare a perpetual inventory record for the above inventory using average cost method (6 marks). (ii) Determine the cost of sales using the average-cost inventory costing methods (round average cost per unit to the nearest dollar) (2 marks). (iii) Calculate gross profit for March using the average-cost inventory costing methods (2 marks).