Santia's Pizza sells an average of 170 pizzas per week, of which 60% are single-topping pizzas and 40% are supreme pizzas with multiple toppings. Singles sell for $8 each and incur variable costs of $4. Supremes sell for $18 each and incur variable costs of $9. The contribution margin per unit and total contribution margin for Singles and Supremes are Singles Supremes Contribution Contribution Total Total Margin per Unit Contribution Margin Margin per Unit Contribution Margin O A. $ 4 $ 408 $ 9 $ 408 a B. 4 408 $ 9 $ 612 OC. $ 4 $ 816 $ 9 $ 306 D. 4 612 $ 9 $ 408