Periodic Inventory Using FIFO, LIFO, and Weighted Average Cost Methods

The units of an item available for sale during the year were as follows:

Jan. $1$ Inventory $15$ units at $$4,000$ $$60,000$

Aug. $7$ Purchase $21$ units at $$4,60096,600$

Dec. $11$ Purchase $18$ units at $$5,10091,800$

Available for sale $54$ units $$248,400$

There are $17$ units of the item in the physical inventory at December $31.$ The periodic inventory system is used. Determine the inventory cost using $($a$)$ the first$-$in$,$ first$-$out $($FIFO$)$ method; $($b$)$ the last$-$in$,$ first$-$out $($LIFO$)$ method; and $($c$)$ the weighted average cost method.

a$.$ First$-$in$,$ first$-$out $($FIFO$)$ method $fill in the blank $1$

b$.$ Last$-$in$,$ first$-$out $($LIFO$)$ method $fill in the blank $2$

c$.$ Weighted average cost method blank$3$