swerve wrote: ↑Mon Nov 30, 2020 11:05 am
Enrollment in City College in 1980 was 83 1/3 percent of enrollment in 1990. What was the percent increase in the college’s enrollment from 1980 to 1990?
A. 10%
B. 16 2/3 %
C. 20%
D. 25%
E. 183 1/3%
The OA is
C
Source: GMAT Prep
A quick approach is to
test values that satisfy the given information.
Given: Enrollment in City College in 1980 was 83 1/3 percent of enrollment in 1990
Important: We can save ourselves some time if we recognize that 83 1/3% is equivalent to 5/6.
So we can rewrite the given information as follows:
Given: Enrollment in City College in 1980 was 5/6 the enrollment in 1990
So, it COULD be the case that the 1990 enrolment was
6 students, and the 1980 enrolment was
5
What was the percent increase in the college’s enrollment from 1980 to 1990?
Percent change = (100)(new - old)/old
= (100)(
6 -
5)/
5
= (100)(1/5)
= 20%
Answer: C
Cheers,
Brent
