The banker's gain on a sum due 3 years hence at 12% per annum is Rs. 270. The banker's discount is:

$$\eqalign{ & T.D. = {\frac{{B.G. \times 100}}{{R \times T}}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\, = Rs.\,\left( {\frac{{270 \times 100}}{{12 \times 3}}} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\, = Rs.\,750 \cr & \therefore B.D. = Rs.\left( {750 + 270} \right) \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = Rs.\,1020 \cr} $$