90 decreased by 20% = 72
90 decreased by 20 percent is 72. Step-by-step solution with the formula and worked example.
90 decreased by 20% = 72
decreased by %
Solution: 90 decreased by 20 percent
Decrease = 20% × 90 = 18
Result = 90 − 18 = 72
Result = 90 − 18 = 72
Step-by-step explanation
- Find the decrease: 20% of 90 = 18.
- Subtract it from the original: 90 − 18 = 72.
- Shortcut: multiply by (1 − 20/100) = ×0.8.
Good to know
Shortcut: decreasing by 20% is the same as multiplying by 0.8 (that is 100% − 20%). So 90 × 0.8 = 72 in one step.
Frequently asked questions
90 decreased by 20 percent
90 decreased by 20% = 72.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
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