I have the following three products. In the past few months I have found I don't have time to make them as much as I want. Also when I make only one product I am left with some unsold.

What is the contribution margin for trucks before considering the limiting resource.

Hour I can work in a week	100
Product	Cars	Trucks	Bikes
Market Demand	20	30	40
Selling Price	60	70	100
Variable costs	40	50	80
Hour required per unit	1	2	4

Select one:

a. 50

b. 40

c. 30

d. 80

e. None of the other answers