Question
A sum of Rs. 12,000 deposited at compound interest becomes double after 5 years .After 20 years . it will become :
Answer: Option D
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`12000 xx (1 + R/100)^5 = 24000`
`rArr (1 + R/100)^5 = 2`
`:.` `[(1 + R/100)^5]^4 = 2^4 = 16`
`rArr (1 + R/100)^20 = 16`
`rArr P(1 + R/100)^20 = 16P`
`rArr 12000(1 + R/100)^20 = 16 xx 12000 ` = 192000
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