Periodic inventory using FIFO, LIFO, and weighted average cost methods

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

$\backslash$table$[[$Jan$.1.,$Inventory,$40$ units at $$165,$$$6,600],[$Aug$.13,$Purchase,$200$ units at $$180,36,000],[$Nov$.30,$Purchase,$60$ units at $$200,12,000],[,$Available for sale,$300$ units,$$54,600]]$

There are $75$ units of the item in the physical inventory at December $31.$ The periodic inventory system is used. Determine the inventory cost using the $($a$)$ first$-$in$,$ firstout $($FIFO$)$ method; $($b$)$ last$-$in$,$ first$-$out $($LIFO$)$ method; and $($c$)$ weighted average cost method.

a$.$ First$-$in$,$ first$-$out $($FIFO$)$ method

$$15,000x$