Required:$1.$ Determine the cost of the inventory on December $31$ by the first$-$in$,$ first$-$out method.If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the units PURCHASED MOST RECENTLY first.Dymac AppliancesCost of the Inventory$-$FIFO MethodDecember $31$ModelQuantityUnit CostTotal CostA$10$$$A$10$B$15$B$15$E$60$G$83$J$34$M$90$M$90$Q$70$Q$70$Total$$2.$ Determine the cost of the inventory on December $31$ by the last$-$in$,$ first$-$out method.If the inventory of a particular model comprises one entire purchase plus a portion of another purchase acquired at a different unit cost, use a separate line for each purchase. If units are in inventory at two different costs, enter the OLDEST units first.Dymac AppliancesCost of the Inventory$-$LIFO MethodDecember $31$ModelQuantityUnit CostTotal CostA$10$$$A$10$B$15$E$60$E$60$G$83$G$83$J$34$J$34$M$90$M$90$M$90$Q$70$Q$70$Total$$3.$ Determine the cost of the inventory on December $31$ by the weighted average cost method.Dymac AppliancesCost of the Inventory$-$Weighted Average MethodDecember $31$ModelQuantityUnit CostTotal CostA$10$$$B$15$E$60$G$83$J$34$M$90$Q$70$Total$

Three identical units of merchandise were purchased during July, as follows:

Assume one unit sells on July $28$ for $$49.$

Determine the gross profit, cost of goods sold, and ending inventory on July $31$ using $($a$)$ first$-$in$,$ first$-$out, $($b$)$ last$-$in$,$ first$-$out, and

$($c$)$ average cost flow methods.