The banker's discount on a sum of money for 1 1/2 years is Rs. 558 and the true discount on the same sum for 2 years is Rs. 600. The rate percent is:  Choices
A) 10% B) 13% C) 12% D) 15% E) 11%
B.D. for 3/2 years	= Rs. 558.   B.D. for 2 years   = Rs.(558 x 2/3 x 2)   = Rs. 744   T.D. for 2 years = Rs. 600.   Therefore, Sum = B.D. x T.D./B.D. - T.D   = Rs. (744 x 600/144	)= Rs. 3100.   Thus, Rs. 744 is S.I. on Rs. 3100 for 2 years.   Therefore, Rate =(100 x 744/3100 x 2)%   = 12%   Answer is 12%
<result>C</result>
The banker's discount on a sum of money for 1 1/2 years is Rs. 558 and the true discount on the same sum for 2 years is Rs. 600. The rate percent is: