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: 40 is subtracted from 70 % of a number , the result is 30 . find the number ?
Options: a ) 150 , b ) 997 , c ) 266 , d ) 288 , e ) 100
[EX A]: e

[EX Q]: Problem: a 6 litre sol is 30 % alcohol . how many litres of pure alcohol must be added to produce a sol that is 50 % alcohol ?
Options: a ) a . 0.6 , b ) b . 1 , c ) c . 2.1 , d ) d . 3 , e ) e . 2.4
[EX A]: e

[EX Q]: Problem: a man buys rs . 52 shares paying 9 % dividend . the man wants to have an interest of 12 % on his money . the market value of each share is :
Options: a ) s . 12 , b ) s . 15 , c ) s . 18 , d ) s . 21 , e ) s . 39
[EX A]:
e