Solution: 
                      		$$\eqalign{
  & F = {\text{Rs}}{\text{.}}\,8100  \cr 
  & R = 5\%   \cr 
  & T = 3\,{\text{months}} = \frac{1}{4}\,{\text{years}}  \cr 
  & BD = \frac{{FTR}}{{100}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\,\, = \frac{{8100 \times \frac{1}{4} \times 5}}{{100}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\,\, = \frac{{2025}}{{20}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\,\, = \frac{{405}}{4}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\,\, = {\text{ Rs}}{\text{.}}\,101.25  \cr 
  & TD = \frac{{FTR}}{{100 + (TR)}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{8100 \times \frac{1}{4} \times 5}}{{100 + \left( {\frac{1}{4} \times 5} \right)}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{2025 \times 5}}{{100 + \left( {\frac{5}{4}} \right)}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{2025 \times 5 \times 4}}{{400 + 5}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{2025 \times 5 \times 4}}{{405}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{405 \times 5 \times 4}}{{81}}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = \frac{{45 \times 5 \times 4}}{9}  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = 5 \times 5 \times 4  \cr 
  & \,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{.}}\,100  \cr 
  & BD - TD = \,101.25 - 100  \cr 
  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{.}}\,1.25 \cr} $$