An air conditioner with an original price of $400 sells on sale for $340. What is the discount rate?
A17.6%
B15.0%
C12.5%
D18.0%
Answer & Solution
Correct answer: B. 15.0%
1. Find the amount of discount: 400 minus 340 equals 60 dollars.
2. The discount rate is the discount divided by the original price.
3. Divide: 60 divided by 400 equals 0.15.
4. Move the decimal point two places to the right and add a percent sign: 15.0%.
5. 17.6% is the trap of dividing the $60 discount by the $340 sale price instead of the $400 original price.
_Source: OpenStax Prealgebra (CC BY 4.0), Ch 6 "Percents", section 6.3 Solve Sales Tax, Commission, and Discount Applications_
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