Task: Question Answering
Input (English): Problem: a , b and c start a business each investing 10,000 . after 6 months a withdrew 5000 , b withdrew 4000 and c invests 6000 more . at the end of the year , a total profit of 34,200 was recorded . find the share of b . 
Options: a ) 9,600 , b ) 21,200 , c ) 28,200 , d ) 20,500 , e ) none of these
Output (English): a