Cost Flow Methods

The following three identical units of Item P$401$C are purchased during April:

Assume that one unit is sold on April $27$ for $$300.$

Determine the gross profit for April and ending inventory on April $30$ using the $($a$)$ first$-$in$,$ first$-$out $($FIFO$)$; $($b$)$ last$-$in$,$ first$-$out $($LIFO$)$; and

$($c$)$ weighted average 'cost method.