Task: Question Answering
Input (English): Problem: a typist uses a sheet measuring 20 cm by 30 cm lengthwise . if a margin of 2 cm is left on each side and a 3 cm margin on top and bottom , then percent of the page used for typing is 
Options: a ) 40 , b ) 60 , c ) 64 , d ) 72 , e ) none
Output (English): c