20 decreased by 15% = 17
20 decreased by 15 percent is 17. Step-by-step solution with the formula and worked example.
20 decreased by 15% = 17
decreased by %
Solution: 20 decreased by 15 percent
Decrease = 15% × 20 = 3
Result = 20 − 3 = 17
Result = 20 − 3 = 17
Step-by-step explanation
- Find the decrease: 15% of 20 = 3.
- Subtract it from the original: 20 − 3 = 17.
- Shortcut: multiply by (1 − 15/100) = ×0.85.
Good to know
Shortcut: decreasing by 15% is the same as multiplying by 0.85 (that is 100% − 15%). So 20 × 0.85 = 17 in one step.
Frequently asked questions
20 decreased by 15 percent
20 decreased by 15% = 17.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
Calculated instantly in your browser. Try your own numbers in the box above, or use the full Percentage Calculator.