Task: Question Answering
Input (English): Problem: a and b undertake to do a piece of work for $ 120 . a alone can do it in 4 days while b alone can do it in 6 days . with the help of c , they finish it in 2 days . find the share of b ? 
Options: a ) $ 150 , b ) $ 100 , c ) $ 200 , d ) $ 50 , e ) $ 40
Output (English): e