A packaged brownie is listed at 190 calories, with 70 of those calories from fat. To the nearest whole percent, what percent of the calories come from fat?
A37%
B27%
C40%
D73%
Answer & Solution
Correct answer: A. 37%
1. The fat calories are the part and the total calories are the whole.
2. Divide the part by the whole: 70 divided by 190.
3. This gives 0.3684... as a decimal.
4. Move the decimal point two places to the right: 36.84%.
5. Round to the nearest whole percent: 37%.
6. 27% comes from misreading 190 as 260 in the division, and 40% comes from rounding 70/190 far too loosely.
7. 73% is the trap of dividing 190 by 260 or simply echoing the 70 with the digits swapped; a quick check shows 73% of 190 is about 139 calories, double the fat listed.
_Source: OpenStax Prealgebra (CC BY 4.0), Ch 6 "Percents", section 6.2 Solve General Applications of Percent_
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