[" A sum of money invested at compound i...

[" A sum of money invested at compound interest amounts to Rs."800" in "3" yrs.and to "],[840" in "4" yrs.Find the rate of interest per annum? "],[[" (A) "2(1)/(2)%," (B) "4%],[" (C) "5%," (D) "6(2)/(3)%]]

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