A certain protective additive increases from 45 days to 60 days the time between required maintenance checks on an indus

[Vincen]

A certain protective additive increases from 45 days to 60 days the time between required maintenance checks on an industrial vehicle. By what percent is the time between maintenance checks increased by using the additive?

A. 25%
B. 33 1/3%
C. 50%
D. 66 2/3%
E. 75%

[spoiler]OA=B[/spoiler]

Source: Princeton Review

[Scott@TargetTestPrep]

A certain protective additive increases from 45 days to 60 days the time between required maintenance checks on an industrial vehicle. By what percent is the time between maintenance checks increased by using the additive?

A. 25%
B. 33 1/3%
C. 50%
D. 66 2/3%
E. 75%

[spoiler]OA=B[/spoiler]

Solution:

The percent increase is:

(New - Old)/Old x 100

(60 - 45)/45 x 100

15/45 x 100

1/3 x 100 = 33 1/3 percent

Answer: B