Cost flow methods

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

DateItem BetaUnitsCostApr. $2$Purchase$1$$$109$Apr. $15$Purchase$1112$Apr. $20$Purchase$1115$Total$3$$$336$Average cost per unit $($$$3363$ units$)$$$112$

Assume that one unit is sold on April $27$ for $$142.$

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.