A painter uses the formula C = 20h + 20c to determine how much he should charge a customer in dollars if a job takes h hours and c cans of paint.
How much should the painter charge if it took 15 hours and 3 cans of paint to paint a house?
A . $ 160
B . $ 220
C . $ 360
D . $ 400
E . $1800
Answer: C