A man invested $\$P$ in a certain bank at the rate of $r\%$ per annum compounded annually. If the amount becomes

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A man invested $\$P$ in a certain bank at the rate of $r\%$ per annum compounded annually. If the amount becomes

by AAPL » Thu Sep 26, 2024 4:34 pm

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A man invested $\$P$ in a certain bank at the rate of $r\%$ per annum compounded annually. If the amount becomes $1.44$ times of itself in $n$ years, what is $n?$

1. $r=20\%$

2. At the same rate of interest the amount becomes $1.728$ times itself in $3$ years

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