Required information

$[$The following information applies to the questions displayed below.$]$

Warnerwoods Company uses a perpetual inventory system. It entered into the following purchases and sales transactions

for March.

Compute gross profit earned by the company for each of the four costing methods. For specific identification, units sold include $140$

units from beginning inventory, $270$ units from the March $5$ purchase, $120$ units from the March $18$ purchase, and $160$ units from the

March $25$ purchase.

Note: Round weighted average cost per unit to two decimals and final answers to nearest whole dollar.

Answer is complete but not entirely correct.