Given that Rs.10,000 is invested in S.I for two years and Rs.8,000 in C.I for two years => C.I - S.I
=> 8,000 { [1 + r/100]2 - 1} = (10,000)2r /100=> 8{ 1 + 2r/100 + r2 / (100)2 - 1} = r/5 => 16r/100 + 8r2/(100)2 = 20r/100 => 4r/10 = 8r2/(100)2 => 8[r/100]2 - 4r/100 = 0 => r/100 {8r/100 -4} = 0 => r = 0% of 50% Since r!= 0%, r =50%
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