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শতকরা বার্ষিক $5\%$ হার সরল মুনাফায় কত টাকা $13$ বছরে সবৃদ্ধিমূল $990$ টাকা হবে?

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মনে করি, মূলধন $P$ টাকা।

আমরা জানি, সবৃদ্ধিমূল $A=P(1+nr)$

এখানে, $n=13$ বছর, $r=5\%=\frac{5}{100}$, $A=990$ টাকা

প্রশ্নমতে,
$990=P\left(1+13 \times \frac{5}{100}\right)$

বা, $990=P\left(\frac{100+65}{100}\right)$

বা, $990=P\frac{165}{100}$

বা, $P=990 \times \frac{100}{165}$

$\therefore P=600$

সুতরাং মূলধন $600$ টাকা। [Answer]

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