Curtis Corporation's Contribution Margin Is $20 Per Unit for Product $\begin{array}{ll}&A&B\\a.&\$10.00&\$6.00\\b.&\$10.00&\$6.66\\c.&\$8.00&\$6.00\\d.&\$8.00&\$6.66\end{array}$

Curtis Corporation's contribution margin is $20 per unit for Product A and $24 for Product B.Product A requires 2 machine hours and Product B requires 4 machine hours.How much is the contribution margin per unit of limited resource for each product? $\begin{array}{ll}&A&B\\a.&\$10.00&\$6.00\\b.&\$10.00&\$6.66\\c.&\$8.00&\$6.00\\d.&\$8.00&\$6.66\end{array}$