compute inventory and cost of goods sold using three cost flow methods in a perpetual inventory system

Inventory: March 1 200 units @ $4.00 $8.00

Purchases:

March 10 500 units @ $4.50 $2,250

March 20 400 units @ $4.75 $1,900

March 30 300 units @ $5.00 1,500

Sales:

March 15 500 units

March 25 400 units

The physical inventory count on March 31 shows 500 units on hand at March 31 and the cost of goods sold for March under (a) FIFO, (b) LIFO, and (c) moving-average cost