The true discount on a certain sum of money due after 2 1/ 2 years at 6% per annum is less than the simple interest on the same sum for the same time by Rs. 81. Find the sum?
Correct Answer: Rs. 4140
Explanation:
Req. amount = [81 x (100 + 6 x 5/2) x 100] / [(6 x 5/2)2]
= (8100 x 115) / 225
= Rs. 4140
Here, S.I. - T.D. = Rs. 81
