2 part algebra question

Question

A rental car company charges $50 plus 15 cents per each mile driven.

Part1. Which of the following could be used to model the total cost of the rental where mm represents the miles driven.

1. C=1.5m+50
2. C=0.15m+50
3. C=15m+50

Part 2. The total cost of driving 200 miles is;

Answer 1

The trick here is keeping track of dollars and cents. 15 cents is equal to 0.15 dollars, so

C= 0.15m + 50

C(200) = 0.15(200)+50 = 30 + 50 = $80.00