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In how many years, a sum will be thrice of it at the rate of interest 5% per annum?
Rate $$= 5\% per annum$$
Let P be the sum
SI $$=3P-P=2P$$
Now, $$2P=\frac{PRT}{100}$$
$$T=\frac{200}{5}=40$$ years
Option B is correct.
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