Mr. Kevin, the owner of the store, is unhappy with the operating results. An analysis of other operating costs reveals that it includes $38,880 variable costs, which vary with sales volume, and $5,400 (fixed) costs. Do notenter dollar signs or commasin the input boxes: a) What is the contribution marain of Kevin Guis fumiture? Contribution margin: 5 b) What is the contribution margin percentage? Round your answer to 2 decimal places. Contribution margin percentage: c) Mr. Kevin estimates that he can increase revenues by 30% by incurring additional advertising costs of $18,000. As a result, how much would Kevin Gui's Furniture's operating profit be? Round all answers to the nearest whole number. Use the negative sign for an operating loss. Incremental revenue: 5 Incremental contribution margin: $ Incremental fixed costs: 1 Incremental operating profits Operating profit (loss) at 30% increased revenue: 1