Task: Question Answering
Input (English): Problem: what will be the difference between simple interest and compound interest @ 10 % per annum on a sum of rs . 1000 after 4 years ? 
Options: a ) rs . 31 , b ) rs . 32.10 , c ) rs . 40.40 , d ) rs . 64.10 , e ) none
Output (English): d