Sugar Lips sells four dozen plain donuts for every dozen custard-filled donuts. A dozen plain donuts sells for $4.00, with total variable cost of $1.80 per dozen. A dozen custard-filled donuts sells for $7.00, with total variable cost of $3.15 per dozen.

1.	Calculate the weighted-average contribution margin.
2.	Determine Sugar LipsSugar Lips'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 Sugar LipsSugar Lips's margin of safety in dollars for AugustAugust 20162016.
4.	Compute the degree of operating leverage for Sugar LipsSugar Lips Donuts. Estimate the new operating income if total sales increase by 10 %10%. (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 10 %10% increase in total sales. (The sales mix remainsunchanged.)

contribution margin income statement:

Sugar Lips Donuts

Contribution Margin Income Statement

Month Ended August 31, 2016

Sales Revenue

$130,000

Variable Costs:

Cost of Goods Sold

$32,700

Selling Costs

17,600

Administrative Costs

8,200

58,500

Contribution Margin

71,500

Fixed Costs:

Selling Costs

28,463

Administrative Costs

9,487

37,950

Operating Income

$33,550

Requirements: