Cullumber Industries incurs unit costs of $7 ($4 variable and $3 fixed) in making an assembly part for its finished product. A supplier offers to make 17,000 of the assembly part at $5 per unit. If the offer is accepted. Cullumber will save all variable costs but no fixed costs. Prepare an analysis showing the total cost saving, if any, that Cullumber will realize by buying the part. (Enter negative amounts using either a negative sign preceding the number eg.-45 or parentheses e.g. (45).) Make Variable manufacturing costs $ Fixed manufacturing costs Purchase price Total annual cost The decision should be to the part. $ Buy $ Net Income Increase (Decrease)