E$6\mathrm{.}15($LO $2,4),$ AN Wisconsin Trading Company uses a periodic inventory system and has a beginning inventory as of April $1$ of $150$ tents. This consists of $150$ tents purchased in February at a cost of $$210$ each. During April, the company had the following purchases and sales of tents.

$\backslash$table$[[$Date$,$Purchases,Sales$],[$Units$,$Unit Cost,Units,Unit Price$],[$April$,,,75,$$$400],[10,200,$$$250,,],[17,,,250,400],[24,300,270,,],[30,,,200,400]]$

Instructions

a$.$ Determine the April cost of goods sold and the cost of the April $30$ ending inventory using FIFO, LIFO, and average$-$cost$.$

b$.$ Calculate Wisconsin Trading's gross profit and gross profit margin for the month of April under each method.

c$.$ Discuss the results of parts $($a$)$ and $($b$),$ providing an explanation of the cause of the results.