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}Xfrac{400}{31}right )

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

left ( frac{400}{31} right ) Rate=left ( frac{100Xx}{x}Xfrac{31}{400}right )

7 years 9 month

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