Problem-Solving and Data AnalysisMediumTax amount from a total that includes tax
Problem-Solving and Data Analysis practice question
A restaurant bill comes to $108 including an 8% sales tax. How many dollars of the bill is tax?
Answer: 8
The pre-tax amount is 108/1.08 = $100, so the tax is 108 − 100 = $8.
Common wrong answers
- If you answered 9
- 9 comes from 108 × 1/12 or a similar slip; 8% of 100 is 8.
- If you answered 100
- 100 is the pre-tax amount, not the tax.
- If you answered 8.64
- 8.64 is 8% of 108 — but the tax is 8% of the PRE-tax amount, which is $100.
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