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Percentages

SAT Math· difficulty 5/5

Radioactive material decays by 30%30\% each year. What fraction of the original remains after 44 years (to nearest 1%)?

  • A

    33%

  • B

    20%

  • C

    30%

  • D

    24%

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Explanation

0.704=0.2401≈24%0.70^4 = 0.2401 \approx 24\%.

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