RRB Non Technical Model Papers 6 with solutions

Question : 5 of 100

Marks: +1, -0

A sum of money placed at compound interest doubles itself in 5 years, it will amount to eight times of itself in

Solution:

2P =P[ 1+ r/100]^r

⇒2 =1 [1+r/100]^5

On cubing both sides

2^3= 1 [1+r/100]^15

So the time taken = 15 years

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