The electricity costs of a business increased from $18,000 one year to $19,000 the next. To the nearest whole percent, what was the rate of increase?

Answer 1

I am not sure how you are learning to do this problem, but if you set up a proportion, you can get the answer

18 over 1 = 19 over x
18x=19
x=1.06

Check your work:
1.06(18)=19000

Answer 2

Garrett washes 3 cars in 72 minutes. How many minutes does it takes Garrett to wash one car?