Task: Question Answering
Input (English): Problem: evaluate : 6402.5 + 640.25 + 64.025 + 6.4025 + 0.64025 
Options: a ) 6819.59775 , b ) 6981.59775 , c ) 6918.59775 , d ) 7113.81775 , e ) 6891.59775
Output (English): d