15 increased by 40% = 21
15 increased by 40 percent is 21. Step-by-step solution with the formula and worked example.
15 increased by 40% = 21
increased by %
Solution: 15 increased by 40 percent
Increase = 40% × 15 = 6
Result = 15 + 6 = 21
Result = 15 + 6 = 21
Step-by-step explanation
- Find the increase: 40% of 15 = 6.
- Add it to the original: 15 + 6 = 21.
- Shortcut: multiply by (1 + 40/100) = ×1.4.
Good to know
Shortcut: increasing by 40% is the same as multiplying by 1.4 (that is 100% + 40%). So 15 × 1.4 = 21 in a single step — handy for adding tax, interest or a markup.
Frequently asked questions
15 increased by 40 percent
15 increased by 40% = 21.
How is it calculated?
See the step-by-step solution above — it uses the standard percentage formula.
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