RRB Junior Engineer Stage 1 Model Papers 2

Question : 3 of 99

Marks: +1, -0

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to four times itself?

Solution:

A=P(1+R/100)^T

⇒2=1(1+R/100)^4

⇒2^2=(1+R/100)^8

=8yrs

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