30 decreased by 40% = 18
30 decreased by 40 percent is 18. Step-by-step solution with the formula and worked example.
30 decreased by 40% = 18
decreased by %
Solution: 30 decreased by 40 percent
Decrease = 40% × 30 = 12
Result = 30 − 12 = 18
Result = 30 − 12 = 18
Step-by-step explanation
- Find the decrease: 40% of 30 = 12.
- Subtract it from the original: 30 − 12 = 18.
- Shortcut: multiply by (1 − 40/100) = ×0.6.
Good to know
Shortcut: decreasing by 40% is the same as multiplying by 0.6 (that is 100% − 40%). So 30 × 0.6 = 18 in one step.
Frequently asked questions
30 decreased by 40 percent
30 decreased by 40% = 18.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
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