Use the information below to answer the following question. Boxwood Company sells blankets for $60 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 5 $20 10 Sale 3 17 Purchase 10 24 20 Sale 6 23 Sale 3 30 Purchase 10 30 Assuming that the company uses the perpetual inventory system, determine the cost of merchandise sold for the sale of May 20 using the LIFO inventory cost method. a. $120 b. $180 c. $136 d. $144