4. Rock Inc. has three divisions, Granite, Lime and Nina. All fxed costs are unavoidable Following is the income statement for the previous year GranteLime Total Saies Variable Costs Contribution Margin Ficed Costs (alocated) Proft Margn 511,000 273,500 228,000 $ 1,012,500 411.400 601,100 546.000 185,000124600 100,800 25,000 148,900 127,.200 263,000 164,250 118,750 62,00031530 5 845 55,100 a. What would Rock's profit margin be if the Lime division were dropped? b. What would Rocks profit margin be if the Nina division were dropped