Charles & Company uses a perpetual inventory system. The following information is available for November:

$\backslash$table$[[,,,$Units,$\backslash$table$[[$Purchase$],[$Price$]],\backslash$table$[[$Sales$],[$Price$]]],[$Nov$.,1,$Inventory,$26,$$$5,],[4,$Purchase,$52,$$$5\mathrm{.}50,],[7,$Purchase,$52,$$$9,],[10,$Sale,$(26),,$$