The contribution margin income statement of Trepani Donuts for August 2024 follows: (Click the icon to view the contribution margin income statement.) (...) Trepani sells six dozen plain donuts for every two dozen custard-filled donuts. A dozen plain donuts sells for $3.80, with total variable cost of $1.71 per dozen. A dozen custard-filled donuts sells for $6.20, with total variable cost of $2.79 per dozen. Read the requirements.