Alpha Company Produces Two Models of a Component: Model K-3

Alpha Company produces two models of a component: Model K-3 and Model P-4. The unit contribution margin for Model K-3 is $6, and the unit contribution margin for Model P-4 is $14. Each model must spend time on a special machine. The firm owns two machines that together provide 4,000 hours of machine time per year. Model K-3 requires 15 minutes of machine time; Model P-4 requires 30 minutes of machine time.
-Refer to the Figure.What is the contribution margin per unit of scarce resource (machine time) for Model P-4?

A) $12
B) $14
C) $24
D) $28