Question

Suppose that you currently own a clothes dryer that costs $30 per month to operate. A new efficient dryer costs $560 and has an estimated operating cost of $20 per month. How long will it take for the new dryer to pay for itsell The clothes dryer will pay for itself in months

Answer 1

After x months, the current dryer cost 30x dollars

After x months, the new dryer cost 560 + 20x dollars

If both costs are equal:

30x = 560 + 20x

30x - 20x = 560

10x = 560

x = 560/10

x = 56

The clothes dryer will pay for itself in 56 months​