Rock Inc. has three divisions, Granite, Lime and Nina. All fixed costs are unavoidable. Following is the income statement for the previous year Sales Granite $516,000 $ 270,500 Lime Nina $225,000 Total $1,011,500 Variable Costs 182,000 124,600 100,800 407,400 Contribution Margin. 334,000 145,900 124,200 604,100 Fixed Costs (allocated) 263,000 160,250 113,750 537,000 Profit Margin $ 71,000 $ (14,350) $ 10,450 $ 67,100 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