Question

suppose you currently own a clothes dryer that costs $20/month to operate. A new efficient dryer cost $510 and has an estimated operating cost of $10/month. How long will it take the new dryer to pay for itself? Answer in months

Answer 1

The first dryer is 25 a month, so 25 times x, or 25x.  

The second is 15 per month, plus an additional $710 cost, so 15x + 710. Set these equations equal to each other to find x, the amount of months where the cost of the first dryer will equal the cost of the second dryer.  

25x= 710 + 15x  

-15x -15x  

10x=710  

x=71 months

Hope this helps

Your Welcome

Answer 2

Answer: 10 months

Here's how you do it: you divide 510 by 10 (510 divided by 10) and it would be 10.