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'.

Q: Problem: a , b and c start a business each investing 20,000 . after 10 months a withdrew 5000 , b withdrew 4000 and c invests 6000 more . at the end of the year , a total profit of 71400 was recorded . find the share of b . 
Options: a ) 20,000 , b ) 21,200 , c ) 23,200 , d ) 20,500 , e ) none of these

A: c
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Q: Problem: how much 60 % of 50 is greater than 30 % of 30 ? 
Options: a ) 21 , b ) 91 , c ) 11 , d ) 17 , e ) 12

A: a
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Q: Problem: milk contains 5 % water . what quantity of pure milk should be added to 10 litres of milk to reduce this to 2 % ? 
Options: a ) 5 litres , b ) 7 litres , c ) 15 litres , d ) can not be determined , e ) none of these

A:
c
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