The present worth of a certain sum due sometime hence is

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:

Given that :- True Discount = Rs. 340 and Present worth = Rs. 3400
We know that ,

Banker’s gain =	( True Discount )	²
Banker’s gain =	Present worth

Banker’s gain =	( 340 )	²
Banker’s gain =	3400

Banker’s gain =	340 x 340	= Rs. 34
	3400