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. 80 respectively. The sum is:

Question:
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. 80 respectively. The sum is:

[A].

Rs. 1800

[B].

Rs. 1450

[C].

Rs. 1360

[D].

Rs. 6800

Answer: Option C

Explanation:

Sum = S.I. x T.D. = 85 x 80 = Rs. 1360.
(S.I.) – (T.D.) (85 – 80)