Problem $15$: Maribel has completed an inventory count and her boss wants to know the current cost of all on hand inventory. Maribel's company uses the Weighted Average Method when determining the cost of inventory.

$\backslash$table$[[,\backslash$table$[[$Cost of$],[$goods$],[$available for$],[$sale$]],\backslash$table$[[$Units$],[$available$.$for$],[$sale$]],\backslash$table$[[$Units in$],[$ending$],[$inventory$]],\backslash$table$[[$Weighted$],[$Average$],[$Cost$]],\backslash$table$[[$Cost of ending$],[$inventory$]]],[$Widget$,$$$135,320\mathrm{.}00,2740,866,,],[$Crank$,$$$9,253\mathrm{.}00,845,23,,],[$Do$-$hickey,$$130,840\mathrm{.}00,12,964,9367,,]]$