please help.

The Boxwood Company sells blankets for $39 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 7 $14 10 Sale 3 17 Purchase 9 $18 20 Sale 6 23 Sale 3 30 Purchase 12 $20 Assuming that the company uses the perpetual inventory system, determine the cost of goods sold for the sale of May 20 using the FIFO inventory cost method. Oa. $92 Ob. $164 Oc. $150 Od. $100