Task: Question Answering
Input (English): Problem: at the end of year x , automobile installment credit accounted for 20 % of all outstanding consumer installment credit . at that time automobile finance companies extended $ 57 billion of credit , or 1 / 3 of the automobile installment credit . how many billion dollars of consumer installment credit was outstanding at that time ? 
Options: a ) 171 , b ) 855 , c ) 870 , d ) 788 , e ) 684
Output (English): b