Question

10000=8000(1+r/100)^2
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Answer 1

$10000 = 8000( \frac{1 + r}{100} ) {}^{2} \\ 10 = 8( \frac{(1 + r) {}^{2} }{10000} ) \\ 50000 = 4(1 + r ) {}^{2} \\ 12500 = (1 + r) {}^{2} \\ \sqrt{12500} = 1 + r \\ 50 \sqrt{5} = 1 + r \\ 50 \sqrt{5} - 1 = r$

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