Cost Flow Methods

The following three identical units of Item K$113$ are purchased during April:

Assume that one unit is sold on April $27$ for $$145.$ 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.