In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Q: Problem: the banker â € ™ s discount of a certain sum of money is rs . 42 and the true discount on the same sum for the same time is rs . 36 . the sum due is 
Options: a ) 252 , b ) 280 , c ) 360 , d ) 450 , e ) none

A: a
****
Q: Problem: how much 60 % of 50 is greater than 30 % of 30 ? 
Options: a ) 21 , b ) 91 , c ) 11 , d ) 17 , e ) 12

A: a
****
Q: Problem: the simple interest and the true discount on a certain sum for a given time and at a given rate are rs . 88 and rs . 80 respectively . the sum is : 
Options: a ) 880 , b ) 1450 , c ) 1600 , d ) 1800 , e ) none

A:
a
****