Task: Question Answering
Input (English): Problem: a , b and c invest in a partnership in the ratio : 7 / 24 / 36 / 5 . after 4 months , a increases his share 50 % . if the total profit at the end of one year is rs . 21600 , then what is b ' s share in the profit ? 
Options: a ) 1000 , b ) 2000 , c ) 3000 , d ) 4000 , e ) 5000
Output (English): d