The bankerâ€™s discount of a certain sum of money is Rs. 80 and the true discount on the same sum for the same time is Rs. 70. The sum due is	Choose the correct choice from the following answers:
A) 210  B) 280  C) 560  D) 450  E) None
Sol.   Sum = B.D. * T.D. / B.D. - T.D. = Rs.[80 * 70 / 80 - 70] = Rs. [80 * 70 / 10] = Rs. 560   Answer 560
<result>C</result>
The bankerâ€™s discount of a certain sum of money is Rs. 80 and the true discount on the same sum for the same time is Rs. 70. The sum due is