RRB Junior Engineer Stage 1 Model Papers 3

Question : 27 of 100

Marks: +1, -0

A sum of ₹ 12,000, deposited at compound interest becomes double after 5 years. How much will it be after 20 years ?

Solution:

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

⇒24000=12000(1+R/100)^5

⇒2=(1+R/100)^5

⇒2^4=(1+R/100)^20=16 \times

i.e. The sum amounts to ₹1,92,000.

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