The Boxwood Company sells blankets for $37 each. The following was taken from the inventory records during May. The company had no beginning inventory on May 1. Date Blankets Units Cost May 3 Purchase 8 $17 10 Sale 4 17 Purchase 9 $15 23 22 20 Sale 4 Sale 3 30 Purchase 12 $19 Assuming that the company uses the perpetual inventory system, determine the cost of goods sold for the sale of May 20 using the LIFO inventory cost method. a. $60 b. $228 c. $68 d. $45