Task: Question Answering
Input (English): Problem: in an examination , the percentage of students qualified to the number of students appeared from school a is 70 % . in school b , the number of students appeared is 20 % more than the students appeared from school a and the number of students qualified from school b is 50 % more than the students qualified from school a . what is the percentage of students qualified to the number of students appeared from school b ? 
Options: a ) 30 % , b ) 70 % , c ) 80 % , d ) 87.5 % , e ) none
Output (English): d