Calculation question Trekking Company markets a climbing kit and uses a perpetual inventory system to account for its merchandise. The beginning balance of the inventory and transactions during January were as follows: January 1 Balance: 18 units at $13 January 12. Purchased 30 units at $14 January 19: Sold 24 units at $17 Jamuary 20 Purchased 24 units at $17 January 27: Sold 27 units If the ending inventory is valued at $357 what inventory cost flow assumption was used? . FIFO. Specific identification Weighted average Od Average costing b C