Find the simple interest on Rs. 68,000 at $16\frac{2}{3}$% per annum for 9 months.

 P = Rs.68000,R = 50/3% p.a and T = 9/12 years = 3/4years.

 S.I. = (P*R*T)/100 = Rs.(68,000*(50/3)*(3/4)*(1/100))= Rs.8500