Task: Question Answering
Input (English): Problem: each light bulb at a hotel is either incandescent or fluorescent . at a certain moment , forty percent of the incandescent bulbs are switched on , and eighty percent of the fluorescent bulbs are switched on . if 75 percent of all the bulbs are switched on at this moment , what percent of the bulbs that are switched on are incandescent ? 
Options: a ) 6.7 % , b ) 10.3 % , c ) 14.5 % , d ) 18.2 % , e ) 23.6 %
Output (English): a