If the true discount on a certain sum due 6 months hence at 15% is Rs. 120, what is the banker’s discount on the same sum for the same time and at the same rate?  Choose the correct choice from the following:
A) 100  B) 115  C) 120  D) 129  E) None
Sol.   B.G. = S.I. on T.D. = Rs. [120 * 15 * 1/2 * 1/100] = Rs. 9.   ∴ (B.D.) - (T.D.) = Rs.9.   ∴ B.D. = Rs. (120 + 9) = Rs. 129   Answer 129
<result>D</result>
If the true discount on a certain sum due 6 months hence at 15% is Rs. 120, what is the banker’s discount on the same sum for the same time and at the same rate?