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 13 % per annum then the gain of b in a period of 3 years is ? 
Options: a ) 320 , b ) 300 , c ) 310 , d ) 315 , e ) 330
Output (English): d