Periodic inventory by three methods

The beginning inventory at Midnight Supplies and data on purchases and sales for a three$-$month period ending March $31$ are as follows:

Determine the inventory on March $31$ and the cost of goods sold for the three$-$month period, using the first$-$in$,$ first$-$out method and the periodic inventory system.

Inventory, March $31$ :

Cost of goods sold $

Determine the inventory on March $31$ and the cost of goods sold for the three$-$month period, using the last$-$in$,$ first$-$out method and the periodic inventory system.

Inventory, March $31$$

$x$

Cost of goods sold $

Inventory, March $31$ :

Cost of goods sold $

Compare the gross profit and the March $31$ inventories, using the following column headings. For those boxes in which you must enter subtracted or negative numbers use a minus sign.