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: how many liters of water must be evaporated from 50 liters of a 2 - percent sugar solution to get a 10 - percent solution ? 
Options: a ) 25 , b ) 30 , c ) 35 , d ) 40 , e ) 45
[EX A]: d

[EX Q]: Problem: in the first 25 overs of a cricket game , the run rate was only 5.4 . what should be the run rate in the remaining 25 overs to reach the target of 400 runs ? 
Options: a ) 16.5 , b ) 13.2 , c ) 10.6 , d ) 11.2 , e ) 7.25
[EX A]: c

[EX Q]: Problem: a shopkeeper sold an article at $ 1050 and gained a 20 % profit . what was the cost price ? 
Options: a ) $ 835 , b ) $ 845 , c ) $ 855 , d ) $ 865 , e ) $ 875
[EX A]:
e