The banker's gain on a sum due 3 years hence at 12% per year is Rs. 270. The banker's discount is:  Choose the correct choice
A) 960
B) 840
C) 1020
D) 760
E) 920

Rationale: "t . d . = ( b . g . x 100 / r x t ) = rs . ( 270 x 100 / 12 x 3 ) = rs . 750 . therefore , b . d . = rs . ( 750 + 270 ) = rs . 1020 . answer is c"
Answer: C