please provide correct answer because these I solved using other similar solutions from cheg, but gone wrong

Kevin Gui's Furniture is a company producing high-end quality furniture for home and offices. The following revenues and cost data for 2022 are: 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 not enter dollar signs or commas in the input boxes. a) What is the contribution marqin of Kevin Gui's Furniture? Contribution margin: $ 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 reyenue. Incremental contribution margin: $ incremental fixed costs: $ Incremental operating profit: Operdting profit (loss) at 30% increased revenue