$!$

Required information

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

Hemming Company reported the following current$-$year purchases and sales for its only product.

$\backslash$table$[[$Date$,$Activities,Units,Acquired at$,$Cost,,Units sold at$,$Retail$],[$January $1,$Beginning inventory,$270$ units,@ $$12\mathrm{.}80,=,$$$3,456,,],[$January $10,$Sales,,,,,$220$ units,$($a$)$ $$42\mathrm{.}80$