Task: Question Answering
Input (English): Problem: the credit card and a global payment processing companies have been suffering losses for some time now . a well known company recently announced its quarterly results . according to the results , the revenue fell to $ 48.0 billion from $ 85.0 billion , a year ago . by what percent did the revenue fall ? 
Options: a ) 20.8 , b ) 30.4 , c ) 43.5 , d ) 32.5 , e ) 33.8
Output (English): c