A lumber store stocks dowels in one standard length of 150 cm. Each dowel costs $20.

A customer wants the store to cut him at minimal cost twenty dowels of length 67cm, eighty dowels of length 51 cm, sixty dowels of length 28 cm, and forty dowels of length 15cm.

A)Make a formula to be copied for all patterns which will calculate the waste where Excel is recommended

B) Formulate an algebraic model for the problem.

C) Explain the solution in words