please help me answer this question

6. In an effort to increase sales, Marvin's Market has decided to increase its 2018 advertising expenses by 20%. According to Marvin's projections, this will lead to a 12% increase in gross revenue, a 10% increase in returns, an 8% increase in cost of goods sold, and 10% increases in overhead expenses and inventory losses. Given these assumptions and Marvin's 2017 profit and loss statement: a. Prepare a projected 2018 profit and loss statement. b. Calculate gross margin, operating margin, and net margin for 2017 and 2018. c. Should Marvin increase his advertising budget