P-M:5-46B Calculating breakeven point for two products, margin of safety, and operating leverage The contribution margin income statement of Delectable Donuts for May 2024 follows: Delectable sells five dozen plain donuts for every dozen custard-tilled donuts. A dozen plain donuts sells for $4.00, with a variable cost of $1.60 per dozen. A dozen custard-filled donuts sells for $8.00, with a variable cost of $3.20 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 categotiles of costs: variable and fixed. 3. Compute Delectable's margin of safety in dollars for May 2024. 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 remains unchanged.)