Percentage Calculations quiz

More questions about Percentage Calculations

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which multiplier gives an item's total price with 7% tax?

   Answer: 1.07

   Why: The multiplier 1 represents 100% of the base price, while 0.07 adds the 7% sales tax directly in one step.

2. 2 Medium

   What percent discount reverses a 25% markup?

   Answer: 20%

   Why: Because the 25% markup creates a larger total base, a smaller percentage discount is needed to return to baseline.

3. 3 Hard

   At 6% yearly growth, what doubling time does the Rule of 72 give?

   Answer: 12 years

   Why: Luca Pacioli printed the rule in 1494. At 6 percent the exact doubling time is 11.9 years, so 72 divided by 6 overshoots by about five weeks.

4. 4 Easy

   Which percentage is mathematically equivalent to the fraction 1/8?

   Answer: 12.5%

   Why: Halving 100% three times gives 50%, then 25%, and finally 12.5%.

5. 5 Medium

   What percentage increase makes a number five times as big?

   Answer: 400%

   Why: Watch the wording: 400% of a number is four times it, while an increase of 400% leaves five times it, because the original 100% stays in the total.

6. 6 Hard

   What minimum percentage lies within two standard deviations by Chebyshev?

   Answer: 75%

   Why: Unlike the empirical rule requiring a bell curve, Chebyshev's 75% bound holds for any distribution shape.