A company's inventory records show the following data for the month of April.

$\backslash$table$[[$Date$,$Activities,Units Acquired,at Cost,Units,Sold :$,$at$,$Retail$],[$April $1,$Beginning inventory,$390$ units $$18,=$$$7,020,,,,],[$April $5,$Purchase,$330$ units $$20,=$$$6,600,,,,],[$April $9,$Sale,,,$540,$units,$5,$$$55$