In its first year of operations, a retailer made the following inventory purchases: 220 units at $7.00 each, 250 units at $8.00 each, and 240 at $10.50 each. At year end, there are 310 units remaining in inventory. The retailer used a periodic inventory system. Using the weighted average cost formula, the cost of ending inventory was: [Please note, when calculating your weighted average cost per unit, please round the dollar value to the nearest 2 decimal places. For example, $8.5683 would round to $8.57. Then, if necessary, round your final answer to the nearest dollar. For example, $2,501.40 would be $2,501] Select one: O a $2,401 O b. $2,854 Oc. $2,790 O d. $2,647 O e $2,573