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: a money lender lent rs . 1000 at 4 % per year and rs . 1400 at 5 % per year . the amount should be returned to him when the total interest comes to rs . 350 . find the number of years .
Options: a ) 3.2 , b ) 3.75 , c ) 4 , d ) 4.25 , e ) 4.5
[EX A]: a

[EX Q]: Problem: a can complete a certain job in 19 days . b is 90 % more efficient than a . in how many days can b complete the same job ?
Options: a ) 6 , b ) 6.25 , c ) 7 , d ) 7.5 , e ) 10
[EX A]: e

[EX Q]: Problem: the c . p of 5 books is equal to the s . p of 20 books . find his gain % or loss % ?
Options: a ) 35 % , b ) 20 % , c ) 5 % , d ) 25 % , e ) 75 %
[EX A]:
e