Mojo Industries tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing

method at the end of each period, as if it uses a periodic inventory system. Assume its accounting records provided the following

information at the end of the accounting period, January $31.$ The inventory's selling price is $$14$ per unit.

Required:

Compute the amount of goods available for sale, ending inventory, and cost of goods sold at January $31$ under each of the following

inventory costing methods:

a$.$ Weighted average cost.

b$.$ First$-$in$,$ first$-$out.

c$.$ Last$-$in$,$ first$-$out.

d$.$ Specific identification, assuming that the January $10$ sale was from the beginning inventory and the January $17$ sale was from the

January $12$ purchase.

$2-$a$.$ Of the four methods, which will result in the highest gros$$ profit?

$2-$b$.$ Of the four methods, which will result in the lowest income taxes?