The contribution margin income statement of Unique Donuts for August 2018 follows: EEE (Click the icon to view the contribution margin income statement.) Requirement 1. Calculate the weighted-average contribution margin. (Round all currency amounts to the nearest cen Sales price per unit Variable cost per unit Contribution margin per unit Sales mix in units Contribution margin Weighted-average contribution margin per unit Plain Filled Total $ 4.00 $ 7.00 1.60 2.80 2.40 4.20 5 4.20