Kershaw Bookstore had 600 units on hand at January 1, costing $18 each. Purchases and sales during the month of January were as follows: Date Jan. 14 Sales 450 @ $28 Purchases 17 25 29 300 @ $20 300@ $22 300 @ $32 Kershaw does not maintain perpetual inventory records. According to a physical count, 450 units were on hand at January 31 The cost of the inventory at January 31, under the FIFO method is: a. $1,200. b. $8,100. c. $9,300. d. $9,600