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 Costa (allocated) Profit Margin Granite $502,000 175,000 327,000 274,000 $ 53,000 Lime Nina $ 270,500 $226,000 124,300 100,800 146,200 125,200 167,250 118,750 $21,050) $ 6,450 Total $998,500 400, 100 598,400 560,000 $ 38,400 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