Find: S.l on Rs 68000 at 1623 1 % per annum for 9 months

P = 68000, R = $\frac{50}{3}$%  & T = 9 months (3/4 years)  

  $S.I=\frac{p\times r\times t}{100}=\frac{(6800\times \frac{50}{3}\times \frac{3}{4})}{100}=Rs.8500$