Nina Rock Inc. has three divisions, Granite, Lime and Nina. All fixed costs are unavoidable. Following is the income statement for the previous year Granite Time Total Sales $511,000 $ 273,000 $227,000 $1,011,000 Variable costs 192,000 124,600 100,500 417,100 Contribution Margin 319,000 148,400 126,500 593,900 Fixed Costs (allocated) 267,000 154,250 105,750 527,000 Profit Margin $ 52,000 $ (5,850) $ 20,750 $ 66,900 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