20 + 25(times the number of hours) = 282.50 You add the 20 because of the one time service fee.
Now lets work this out. 20 + 25x =282.50 25x = 262.50 (subtract both sides by 2 to get the x's alone) x = 10.5 (divide both sides by 25 to get just x) x = 10.5 hours
