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 $509,000 191,000 318,000 273,000 $ 45,000 Lime Nina $ 272,000 $230,000 125,000 100,900 147,000 129,100 160, 250 108,750 $ (13,250) $ 20,350 Total $1,011,000 416,900 594,100 542,000 $ 52,100 a. What would Rock's profit margin be if the Lime division were dropped