SOLUTION: A plumber charges R240 per hour for a labour plus a call out fee of R60. When he. Repaired Mrs Mofokeng's leaking tap he charged her R540. How long did the plumber take to make the

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A plumber charges R240 per hour for a labour plus a call out fee of R60. When he. Repaired Mrs Mofokeng's leaking tap he charged her R540. How long did the plumber take to make the      Log On


   

Question 852689: A plumber charges R240 per hour for a labour plus a call out fee of R60. When he. Repaired Mrs Mofokeng's leaking tap he charged her R540. How long did the plumber take to make the repair?
Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
240 per hour plus a flat fee of 60.
total cost was 540.
equation for total cost is:
c = 60 + 240h
c is the total cost.
h is the number of hours.
you have c = 540 so the equation becomes:
540 = 60 + 240h
subtract 60 from both sides of the equation to get:
540 - 60 = 240h
simplify to get:
480 = 240h
divide both sides of the equation by 240 to get:
480 / 240 = h
simplify to get:
h = 2
he worked for 2 hours.
60 + 2 * 240 = 60 + 480 = 540