Task: Question Answering
Input (English): Problem: a collection of books went on sale , and 2 / 3 of them were sold for $ 1.50 each . if none of the 36 remaining books were sold , what was the total amount received for the books that were sold ? 
Options: a ) $ 180 , b ) $ 135 , c ) $ 108 , d ) $ 60 , e ) $ 54
Output (English): c