Task: Question Answering
Input (English): Problem: if a lends rs . 3500 to b at 10 % per annum and b lends the same sum to c at 14 % per annum then the gain of b in a period of 3 years is ? 
Options: a ) 400 , b ) 410 , c ) 460 , d ) 420 , e ) 430
Output (English): d