Task: Question Answering
Input (English): Problem: at a certain conference , 78 % of the attendees registered at least two weeks in advance and paid their conference fee in full . if 10 % of the attendees who paid their conference fee in full did not register at least two weeks in advance , what percent of conference attendees registered at least two weeks in advance ? 
Options: a ) 18.0 % , b ) 62.0 % , c ) 79.2 % , d ) 86.67 % , e ) 82.0 %
Output (English): d