Task: Question Answering
Input (English): Problem: a sum of money deposited at c . i . amounts to rs . 2560 in 3 years and to rs . 2989 in 4 years . find the rate percent ? 
Options: a ) 30 % , b ) 10 % , c ) 20 % , d ) 16 % , e ) 50 %
Output (English): d