oxwood company sells blankets for $60 each. the following information was taken from the inventory records during may. the company had no beginning inventory on may 1. boxwood uses a perpetual inventory system. 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 determine the cost of goods sold for the sale of may 20 using the lifo inventory costing method. a.$136 b.$120 c.$180 d.$144