Question 123848
The part of the $195 represented by the hourly charges must have been 15 * 9 = $135, so the one-time fee must be 195 - 135 = 60.


So for any number of hours x, the total fee y will be given by {{{y=15x+60}}}


{{{graph(400,400,-10,20,-10,402,15x+60)}}}