Task: Question Answering
Input (English): Problem: what will be the difference between simple and compound interest @ 10 % per annum on a sum of $ 1000 after 4 years ? 
Options: a ) $ 48.12 , b ) $ 52.64 , c ) $ 64.10 , d ) $ 72.85 , e ) $ 60.10
Output (English): c