Cost Accounting Same Net Income

"a) What is Wilson’s break-even point in cases of widgets for the current year?
b) What selling price per case must Wilson charge to cover the 15% increase in variable production costs (the 15% increase includes all variable costs associated with this problem) and still maintain the current contribution margin percentage?
c) What is the number of units that Wilson must achieve in the coming year to maintain the same net income after taxes as projected for the current year if the selling price of widgets remains at $9.60 per case and the variable production costs of widgets increase 15%?

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