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1. 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

Solution:

\begin{aligned} Sum = \frac{S . I . \times T . D .}{S . I . - T . D .} \\ = \frac{85 \times 80}{85 - 80} \\ = R s . 1360 \end{aligned}

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