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

Rs. 21
Rs. 17
Rs. 18
Rs. 34
Explanation:

$BG =\dfrac{{TD}^2 }{PW} = \dfrac{{340}^2 }{3400}$

$= \dfrac{340 \times 340 }{3400} = \dfrac{340}{10} = Rs.34$

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