Rock Inc. has three divisions, Granite, Lime and Nina. All fixed costs are unavoidable. Following is the income statement for the previous year: Sales Variable costs Contribution Margin Fixed Costs (allocated) Profit Margin Granite Lime Nina $ 516,000 $ 270,500 $228,000 180,000 124,900 100, 200 336,000 145,600 127,800 267,000 168,250 115, 750 $ 69,000 $ (22,650) $ 12,050 Total $1,014,500 405, 100 609,400 551,000 $ 58,400 a. What would Rock's profit margin be if the Lime division were dropped? b. What would Rock's profit margin be if the Nina division were dropped