In how many years will a sum of Rs. 800 at 10% per annum compounded semiannually become Rs. 926.10?
A
212
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B
112
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C
213
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D
113
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Solution
The correct option is B112 Rate = 5% per half year.
Let time = 2n half years = n years.
Then 800(1+5100)2n=926.10⇒(2120)2n=926.10800=92618000=(2120)3∴2n=3orn=32years.