Perpetual inventory - average cost method

provide details and step by step for calculations

Company Y has the following inventory data : August 1 Beginning inventory 20 units at $10 Purchases 130 units at $15 17 ale 80 units 25 Purchases 30 units at $20 30 Sale 50 units Assuming that a perpetual inventory system is used , what is ending inventory ( rounded ) under the average cost method for August ? DO NOT ROUND INTERMEDIATE CALCULATIONS ) a . $641. 33 b . 5611 .11 $800.00 d. $500.00