The simple interest and the true discount on a certain sum...

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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

Solution(By Examveda Team)

$$\eqalign{ & {\text{Sum}} = \frac{{S.I.\, \times\, T.D.}}{{ {S.I.} - {T.D.} }} \cr & = \frac{{85 \times 80}}{{ {85 - 80} }} \cr & = Rs.\,1360 \cr} $$

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