Windy Company sold 10,000 swing sets this past year at $140 each. The company incurred expenses of $280,000 for rent, administrative salaries, and insurance for the building. The cost per unit for Windy was $84. The CEO, Ms. Dennis, wants to know what the contribution margin was for the year as a percent of sales, how much profit would be earned with an additional $170,000 in sales, and what the profit would be on an additional 3,500 units in sales. Please, show your calculation steps. 1