Rs. 20 is the true discount on Rs. 260 due after a certain time. What will be the true discount on the same sum due after half of the former time, the rate of interest being the same? Choose the correct choice:
A) 10.49  B) 10.4  C) 10.42  D) 10.41  E) 10.46
S.I. on Rs. (260 - 20) for a given time = Rs. 20.   S.I. on Rs. 240 for half the time = Rs. 10.   T.D. on Rs. 250 = Rs. 10.   T.D. on Rs. 260 = Rs. 10	x 260 = Rs. 10.40   250   Answer: 10.4
<result>B</result>
Rs. 20 is the true discount on Rs. 260 due after a certain time. What will be the true discount on the same sum due after half of the former time, the rate of interest being the same?