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1. The present worth of a certain sum due sometime hence is Rs. 3400 and the true discount is Rs. 340. The banker's gain is:

A. Rs. 21

B. Rs. 17

C. Rs. 18

D. Rs. 34

Solution:

\begin{aligned} B G = \frac{{(T D)}^{2}}{P W} \\ = \frac{{(340)}^{2}}{3400} \\ = \frac{340 \times 340}{3400} \\ = \frac{340}{10} \\ = Rs . 34 \end{aligned}

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