Current Attempt in Progress

A company had the following inventory activity during November:

$\backslash$table$[[,$Units,Unit Cost,Total Cost,Unit Price,$],[$Beginning inventory,$100,$$$20\mathrm{.}00,$$$2,000,,],[$Purchase:$,$November $3,900,$$$21\mathrm{.}00,18,900,],[$Sale:$,$November $5,(900),,,$$$30\mathrm{.}00$