Question 262851
please check my answer:a plumber gave an estimate for the renovation of a kitchen.her hourly pay is 24.$per hour and the plumbing parts will cost 60.$.if her total estimate is 228.$,how many hours does she expect the job to take? my answer is 7 hours

The total cost of the job is fixed cost + variable cost.

If the number of hours worked is w then we have:

Total Cost = 60 (fixed cost) + w*24 (variable cost).

So we have:

228 = 60 + 24*w
24w = 168
w = 7

You are correct :)