A sum of amount at r compound interest doubles in 2 years In 6years it will be a times of the origin...........

Quantitative Aptitude ( CCS) Compound Interest

A sum of amount at r% compound interest doubles in 2 years. In 6years it will be a times of the original principal. What is the value of r?

A=P(1+r/100)ⁿ
2P=P(1+r/100)²
2=(1+r/100)²
Take both side cube , it become 6 years
2³ = { (1+r/100)² } ³
8= { (1+r/100)⁶ }.

Hence, option 1 is the correct answer.

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