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प्रश्न
In how many years will Rs. 7,000 amount to Rs. 9,317 at 10% per annum compound interest?
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उत्तर
`A = P(1+r/100)^n`
A = 9317
P = 7000
r = 10%
n = ?
9317 = 7000 `(1+10/100)^n`
9317 = 7000(1.1)n
`9317/7000 = (1.1)^n`
1.331 = (1.1)n
(1.1)2 = 1.21
(1.1)3 = 1.331
(1.1)n = 1.331
n = 3
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