The simple interest and the true discount on a certain sum for a given time and at a given rate are Rs. 85 and Rs. 70 respectively. The sum is:	Choose the correct choice from the following answers.
A) 1360  B) 1450  C) 1600  D) 1800  E) None
Sol.   Sum = S.I. * T.D. / (S.I)-(T.D.) = 85 * 70 / (85 - 70) = Rs.396.7.   Answer None
<result>E</result>
The simple interest and the true discount on a certain sum for a given time and at a given rate are Rs. 85 and Rs. 70 respectively. The sum is: