Calculating total cost from range of cell tally's by cost of item.

I have a workbook of supply control and pricing. The goal is to have B5 to AL5 as tally spots. Then have AM5 as the spot for total cost of supplies in accordance to the amount of tallys written in B5 to AL5. The trick is all of the cost data is broken down on another sheet.

Much help needed! Have attached the xls file.

Thank you!