ten students attended a campus movie and each paid

Question

ten students attended a campus movie and each paid for their ticket. Twenty faculty members each paid 2d for their ticket. Thirty non-student each paid 3d for their ticket. How much was collected in ticket sales?

Answer 1

I'm assuming the students paid "d" for their ticket, correct? 

10 students * d cost ... 10d

20 teachers * 2d... 20 * 2d

30 non-students * 3d... 30 * 3d

 

The expression becomes:

10d + (20*2d) + (30*3d)

 

Simplify:

10d + 40d + 90d

 

140d