Task: Question Answering
Input (English): Problem: a student was asked to find 4 / 5 of a number . but the student divided the number by 4 / 5 , thus the student got 36 more than the correct answer . find the number . 
Options: a ) 60 , b ) 70 , c ) 80 , d ) 90 , e ) 100
Output (English): c