A $40 item rises by 25%. What is the new price?

$50, because 25% of 40 is 10.

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  1. $45
  2. $50 ✔
  3. $65

Why: 25% of 40 is 0.25 x 40 = 10. Add the increase: 40 + 10 = 50.

Huh, didn't know that: A 100% increase doubles the original amount.

The dad joke
Why was the equal sign so humble? It never thought it was less than or greater than anyone.
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References

Answer: $50. 25% of 40 is 0.25 x 40 = 10. Add the increase: 40 + 10 = 50.

  1. OpenStax Prealgebra 2e, 6.2 Solve General Applications of Percent openstax.org/books/prealgebra-2e/pages/6-2-solve-general-applications-of-percent
    Then we find what percent the amount of increase is of the original amount.
    Checked 2026-10-12.

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