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 11.5 % per annum then the gain of b in a period of 3 years is ? 
Options: a ) 157.20 , b ) 157.29 , c ) 157.50 , d ) 157.30 , e ) 157.23
Output (English): c