Task: Question Answering
Input (English): Problem: a , b and c enter into partnership . a invests some money at the beginning , b invests double the amount after 6 months , and c invests thrice the amount after 8 months . if the annual gain be rs . 12000 . a ' s share is ? 
Options: a ) 2500 , b ) 3500 , c ) 4500 , d ) 2800 , e ) 4000
Output (English): e