The banker's gain on a sum due 6 years hence at 12% per annum is Rs. 900. What is the banker's discount? Select the correct option.
A) 1240  B) 1120  C) 1190  D) 2150  E) none of these

Rationale: "explanation : td = ( bg × 100 ) / tr = ( 900 × 100 ) / ( 6 × 12 ) = rs . 1250 bg = bd – td = > 900 = bd - 1250 = > bd = 2150 answer : option d"
Answer: D