If the compound interest on a certain sum at 1623 % to 3 years is Rs.1270, find the simple interest on the same sum at the same rate and f or the same period.

Let the sum be Rs. x. Then,

  $C.I=x*\frac{50}{300*100}3-x=\frac{343x}{216}-x=\frac{127x}{216}$ 

$\iff \frac{127x}{216}=1270$ 

$x=2160$ 

Thus, the sum is Rs. 2160

  $S.I=Rs.2160*\frac{50}{3}*3*\frac{1}{100}=Rs 1080$