20 if a certain sum of money becomes 8 times of itself in 3years. find rate of compound interest

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( 8 x=2left(1+frac{2}{100}right)^{3} ) ( left(1+frac{2}{100}right)^{3}=8 ) ( frac{1+x}{100}=2 ) ( 100+2=20 ) ( 2=100 ) ( 16 x=xleft(1+frac{10 x}{100}right) d ) ( 16=2+1 ) ( 2^{4}=2^{pm} ) ( 1=4 ) yeas

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