Maths / Comparing Quantities / Simple Interest

QUESTION

A sum of money triples itself 15 years 6 months. In how many years would it double itself?

 OPTIONS A. 6 years 3 month B. 7 years 9 month C. 8 years 3 months D. 9 years 6 months
Right Option : B

EXPLANATION
Explain TypeExplanation Content
Text

Let the sum be x.Then

S.I=2x and Time=$\frac{31}{2}years$

$Rate=\left ( \frac{100X2x}{x}X\frac{400}{31}\right )$

Now, sum =x.S.I=x and Rate=

$\left ( \frac{400}{31} \right ) \\\\Rate=\left ( \frac{100Xx}{x}X\frac{31}{400}\right )$

7 years 9 month

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