18. Kosinski Bookstore had 200 units on hand at May 1, costing $10 each. Purchases and sales during the month of May were as follows: Date May -5 Sales -100S45 Purchases 15 20 29 200 @ $11 150 $12 250 @ $16 Kosinski does not-maintain perpetual inventory records. According to a physical count, 200 units were on hand at May 31. The cost of the inventory at May 31, under the FIFO method is: a. $2,285 b. $2,350. c. $2,680. d. $2,920