30 decreased by 20% = 24
30 decreased by 20 percent is 24. Step-by-step solution with the formula and worked example.
30 decreased by 20% = 24
decreased by %
Solution: 30 decreased by 20 percent
Decrease = 20% × 30 = 6
Result = 30 − 6 = 24
Result = 30 − 6 = 24
Step-by-step explanation
- Find the decrease: 20% of 30 = 6.
- Subtract it from the original: 30 − 6 = 24.
- 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 30 × 0.8 = 24 in one step.
Frequently asked questions
30 decreased by 20 percent
30 decreased by 20% = 24.
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.