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 can row his boat with the stream at 19 km / h and against the stream in 11 km / h . the man ' s rate is ? 
Options: a ) 4 kmph , b ) 2 kmph , c ) 7 kmph , d ) 8 kmph , e ) 3 kmph
[EX A]: a

[EX Q]: Problem: if 20 % of a number = 1000 , then 120 % of that number will be ? 
Options: a ) 20 , b ) 120 , c ) 360 , d ) 6000 , e ) 820
[EX A]: d

[EX Q]: Problem: two men started from the same place walk at the rate of 10 kmph and 12 kmph respectively . what time will they take to be 20 km apart , if they walk in the same direction ? 
Options: a ) 5 hours , b ) 10 hours , c ) 8 hours , d ) 10 hours , e ) 12 hours
[EX A]:
b