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RS aggarwal Practice Aptitude (Simple interest) Questions and Answers with explanation

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Aptitude question and answer on Simple interest

Question : At a certain rate of simple interest, a certain sum doubles itself in 10 years. If will triple itself in 
A.    12 years
B.    15 years
C.    20 years
D.    30 years

Answer : C.  20 years

Let     sum  = x.
Then   S.I.  = x and time = 10 years
\(\dot{..}\) Rate = \(\Bigg( {100 \times x \over x \times 10} \Bigg) \%=10\%\)
Now , Sum = x, S.I.=2x , Rate = 10 %
\(\dot{..}\) Time = \(\Bigg( {100 \times 2x \over x \times 10} \Bigg) \)years
                = 20 years