The contribution margin income statement of Too Sweet Donuts for August 2018 follows (Click the icon to view the contribution margin income statement.) Too Sweet sells five dozen plain donuts for every dozen custard-filled donuts. A dozen plain donuts sells for $4.00, with total variable cost of $1.60 per dozen A dozen custard-filled donuts sells for $7.00, with total variable cost of $2.80 per dozen Read the requirements Requirement 1. Calculate the weighted average contribution margin. (Round all currency amounts to the nearest cent) Contribution margin Weighted average contribution margin per unit Plain Filled Total