The contribution margin income statement of Delectable Donuts for August 2014 follows:

Delectable sells four dozen plain donuts for every dozen custard-filled donuts. A dozen plain donuts sells for $ 4.00, with total variable cost of $ 1.60 per dozen. A dozen custard-filled donuts sells for $ 5.00, with total variable cost of $ 2.00 per dozen.

Requirements
1. Calculate the weighted-average contribution margin.
2. Determine Delectable’s monthly breakeven point in dozens of plain donuts and custard-filled donuts. Prove your answer by preparing a summary contribution margin income statement at the breakeven level of sales. Show only two categories of costs: variable and fixed.
3. Compute Delectable’s margin of safety in dollars for August 2014.
4. Compute the degree of operating leverage for Delectable Donuts. Estimate the new operating income if total sales increase by 20%. (Round the degree of operating leverage to four decimal places and the final answer to the nearest dollar. Assume the sales mix remains unchanged.)
5. Prove your answer to Requirement 4 by preparing a contribution margin income statement with a 20% increase in total sales. (The sales mix remainsunchanged.)

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DELECTABLE DONUTS Contribution Margin Income Statement Month Ended August 31, 2014 Sales Revenue Variable Costs: 150,000 Cost of Goods Sdd Selling Costs Administrative Costs 41,000 15,000 4000 60,000 Contribution Margin Fixed Costs 90,000 Selling Costs Admanistrative Costs 37,800 12,600 50,400 Operating Income 5 39,600