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 Total $511,000 $273,000 $225,000 $1,009,000 177,eee 124,400 180,400 401,800 334,000 148,600 124,600 687,200 260,000 169,250 113,750 543,eee $ 74,000 $ (20,650) $ 1,150 $ 64,2ee 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