Task: Question Answering
Input (English): Problem: a room 3 m 21 cm long and 7 m 77 cm broad is to be paved with square tiles . find the least number of square tiles required to cover the floor . 
Options: a ) 27636 , b ) 27640 , c ) 27647 , d ) 27713 , e ) 27675
Output (English): d