Sweeps Co$.($a calendar year end business$)$ uses a periodic inventory system. Its records show the following for the month of August, in which $600$ units were sold for a total of $$6,500$ cash:

$\backslash$table$[[$Date$,,$Number of units,Cost per unit,Total cost$],[$August $1,\backslash$table$[[$Inventory$,],[$beginning$]],400,$$$8\mathrm{.}40,$$$3,360$