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.) Quantity Date Beginning Balance September 17 September 24 September 29 Unit Cost $3.00 $2.50 Purchase Sale Purchases $6.00 O A. 90 units @ $3.00 and 25 units @ $2.50 and 30 units @ $6.00 OB. 145 units @ $3.48 O c. 115 units @ $2.82 and 30 units @ $6.00 O D. 65 units @ $3.00 and 50 units @ $2.50 and 30 units @ $6.00