What is the difference between the banker's discount and the true discount on Rs.8100 for 3 months at 5%

F = Rs. 8100
R = 5%

T = 3 months = 1/4 years

$BD=\frac{FTR}{100}=\frac{8100\times \frac{1}{4}\times 5}{100}=Rs.101.25$

$TD=\frac{FTR}{100+TR}=\frac{8100\times \frac{1}{4}\times 5}{100+\frac{1}{4}\times 5}=Rs.100$

Therefore BD - TD = 101.25-100 = Rs.1.25