Task: Question Answering
Input (English): Problem: a , b and c start a business with each investing rs 20000 . after 5 months a withdraws rs 5000 , b withdraws rs 4000 and c invests rs 6000 more . at the end of the year , a total profit of rs 69900 was recorded . find the share of a . 
Options: a ) 20000 , b ) 21500 , c ) 20500 , d ) 22000 , e ) 21000
Output (English): c