Task: Question Answering
Input (English): Problem: in one year , the population , of a village increased by 10 % and in the next year , it decreased by 10 % . if at the end of 2 nd year , the population was 7920 , what was it in the beginning ? 
Options: a ) 8008 , b ) 8000 , c ) 8022 , d ) 8021 , e ) 8022
Output (English): b