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'.

[EX Q]: Problem: the calendar of the year 2028 can be used again in the year ? 
Options: a ) 2041 , b ) 1951 , c ) 2056 , d ) 1971 , e ) 1973
[EX A]: c

[EX 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
[EX A]: a

[EX Q]: Problem: find the amount on rs . 5000 in 2 years , the rate of interest being 20 % per first year and 25 % for the second year ? 
Options: a ) 3377 , b ) 2678 , c ) 5460 , d ) 7500 , e ) 1671
[EX A]:
d