The standard bus fare in Chicago rose from $1.50 in 1995 to $2.25 in 2008. What was the percent increase?
A50%
B75%
C33%
D25%
Answer & Solution
Correct answer: A. 50%
1. Find the amount of increase: 2.25 minus 1.50 equals 0.75.
2. An increase is measured against the original amount, so divide: 0.75 divided by 1.50 equals 0.5.
3. Convert to percent form: the fare rose 50%.
4. Dividing by the new fare of 2.25 instead of the original gives 33%, the wrong-base trap.
_Source: OpenStax Elementary Algebra (CC BY 4.0), Ch 3 "Math Models", section 3.2 Solve Percent Applications_
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