Given the following inventory activity, what is ending inventory using the perpetual average costing method? (Round any intermediary calculations to the nearest cent and your final answer to the nearest dollar.) Date Quantity Unit Cost Beginning Balance 120 $7.00 September 17 Purchase 30 $4.50 September 24 Sale 15 September 29 Purchases 20 $8.00 O A. 155 units @ $6.69 OB. 105 units @ $7.00 and 30 units @ $4.50 and 20 units @ $8.00 O C. 120 units @ $7.00 and 15 units @ $4.50 and 20 units @ $8.00 OD. 135 units @ $6.50 and 20 units @ $8.00