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Banker’s Gain (B.G.) = (B.D.) - (T.D.) for the unexpired time.

1.	B.D. = S.I. on bill for unexpired time.

2.	B.G. = (B.D.) - (T.D.) = S.I. on T.D. = (T.D.)²/P.W.

3.	T.D. = √P.W.x B.G

4.	B.D =		Amount X Rate X Time/100

5.	T.D =		Amount X Rate X Time / 100 + (Rate X Time)

6.	Amount =		B.D x T.D. / B.D. - T.D.

7.	T.D =		B.G x 100 / Rate X Time