The contribution margin income statement of Delectable Donuts for August 2024 follows: : Delectable sells five dozen plain donuts for every two dozen custard-filled donuts. A dozen plain donuts sells for $4.00, with total (Click the icon to view the contribution margin income statement.) variable cost of $1.80 per dozen. A dozen custard-filled donuts sells for $6.80, with total variable cost of $3.06 per dozen. Requirement 1. Calculate the weighted-average contribution margin. (Round all currency amounts to the nearest cent.)