Answer:
Dryer will pay for itself in 63 months or 5 years and 3 months.
Step-by-step explanation:
Let after x months new dryer will pay for itself.
Old dryer is costing $25 to operate so after x months it will cost = 25x
Similarly new dryer which cost $630 and operating cost is $15 per month.
So after x months new drier will cost = $(630 + 15x)
If the new dryer pay for itself in x months then total cost of both the dryers after x months should be same.
Therefore, 25x = 630 + 15x
25x - 15x = 630
10x = 630
x = [tex]\frac{630}{10}[/tex]
x = 63 months
Or x = 5 years 3 months
Answer is 63 months or 5 years 3 months.
