Question

A runner increased her distance from 9 miles to 12.5 miles a week. Find the percent increase in mileage.

A. 28%

B. 39%

C. 58%

D. 42%

Answer 1

39 percent is increase in mileage.

Thus, the correct option is B. 39%.

Explanation:

Given:

A runner increased her distance from 9 miles to 12.5 miles a week.

Now, to find percent increase in mileage.

Previous mileage = 9 miles.

Present mileage = 12.5 miles.

Mileage increase = 12.5 - 9 = 3.5 miles.

Now, to get the percent increase in mileage:

`(Mileage\ increased)/(previous\ mileage) * 100`

`=(3.5)/(9) * 100`

`=(350)/(9)`

`=38.88\%.`

Approximately the percent increase = 39%.

Therefore, 39% is increase in mileage.

Thus, the correct option is B. 39%.