Tony’s weekly cost, C, in dollars, of operating a taxi business can be approximated by the equation C = 0.20m + 80, where m is the number of miles driven in a week. 

(a) Draw a graph of weekly cost versus the number of miles driven for up to and including 500 miles driven per week.

(b) If, during one week, Tony drove the taxi 150 miles, what would be the cost?$.

(c) How many miles would Tony have to drive for the weekly cost to be $104?