Not sure how to do this

Brief Exercise 12-4 Bridgeport 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 17,800 of the assembly part at $5 per unit. If the offer is accepted Bridgeport will save al variable costs but no fixed costs. Prepare an analysis showing the total cost saving, if any, Bridgeport will reae by buying the part. (If amount decreases net income then enter the amount using either a negative sign preceding the number e.g. -45 or parentheses e.g. (45).) Net Income Increase (Decrease) Buy Make Variable Fixed manufacturing costs Purchase price costs Total annual cost the part The decision should be to Click if you would like to Show Work for this question: Qpen Show Work