The contribution margin income statement of Dandy Donuts for May 2014 follows:

Dandy sells three dozen plain donuts for every dozen custard-filled donuts. A dozen plain donuts sells for $ 6, with a variable cost of $ 3 per dozen. A dozen custard-filled donuts sells for $ 8, with a variable cost of $ 4 per dozen. 

Requirements 

1. Calculate the weighted-average contribution margin. 

2. Determine Dandy’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 Dandy’s margin of safety in dollars for May 2014. 

4. Compute the degree of operating leverage for Dandy Donuts. Estimate the new operating income if total sales increase by 25%. (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 25% increase in total sales. (The sales mix remains unchanged.)

DANDY DONUTS Contribution Margin Income Statement Month Ended May 31, 2014 Sales Revenue Variable Costs: 190,000 Cost of Goods Sold 56,000 Selling Costs Administrative Costs 20,000 19,000 9,000 95,000 Contribution Margin Fixed Costs: Selling Costs Administrative Costs 50,700 27,300 78,000 Operating Income 17,000