Neverstop Corporation sells item A as part of its product line. Information about the beginning inventory, purchases, and sales of item A are given in the following table for the first six months of the current year. The company uses a perpetual inventory system:

$\backslash$table$[[,$Purchases,Sales$],[$Date$,$Number of Units,Unit Cost,Number of Units,Sales Price$],[$January $1($beginning inventory$),550,$$$3\mathrm{.}50,350,$$$5\mathrm{.}00$