800 decreased by 20% = 640
800 decreased by 20 percent is 640. Step-by-step solution with the formula and worked example.
800 decreased by 20% = 640
decreased by %
Solution: 800 decreased by 20 percent
Decrease = 20% × 800 = 160
Result = 800 − 160 = 640
Result = 800 − 160 = 640
Step-by-step explanation
- Find the decrease: 20% of 800 = 160.
- Subtract it from the original: 800 − 160 = 640.
- 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 800 × 0.8 = 640 in one step.
Frequently asked questions
800 decreased by 20 percent
800 decreased by 20% = 640.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
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