Write a Cost Function for the Problem $\$ 1.50$ Plus 15 Cents Per Minute

Multiple Choice

Write a cost function for the problem. Assume that the relationship is linear.
-A cab company charges a base rate of $\$ 1.50$ plus 15 cents per minute. Let $C(x)$ be the cost in dollars of using the cab for $x$ minutes.

A) $C(x) =1.50 x+0.15$
B) $C(x) =0.15 x+1.50$
C) $C(x) =1.50 x-0.15$
D) $C(x) =0.15 x-1.50$