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 man ' s speed with the current is 12 km / hr and the speed of the current is 2 km / hr . the man ' s speed against the current is 
Options: a ) 8 , b ) 10 , c ) 11 , d ) 12 , e ) 13
[EX A]: a

[EX Q]: Problem: evaluate : 28 % of 400 + 45 % of 250 
Options: a ) 220.3 , b ) 224.5 , c ) 190.3 , d ) 150 , e ) none of these
[EX A]: b

[EX Q]: Problem: the length of a rectangular floor is more than its breadth by 200 % . if rs . 624 is required to paint the floor at the rate of rs . 4 per sq m , then what would be the length of the floor ? 
Options: a ) 22.8 m . , b ) 21.6 m . , c ) 21.1 m . , d ) 20.6 m . , e ) 22.5 m .
[EX A]:
b