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A certain sum amounts to Rs 798.60 after 3 years and Rs.878.46 after 4 years. Finf the interest rate and sum.

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ext{Amount obtained through simple interest, }A=P(1+rt)\\
ext{Hence, } P(1+3r)=798.60 ext{ and } P(1+4r)=878.46\\
\Rightarrow rP=79.86 ext{ and } P=559.02\\
herefore r=\frac{100}{7} \%=14.2857\% ext{ p.a.}
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