Task: Question Answering
Input (English): Problem: population of a city decreases by 10 % at the end of first year and increases by 10 % at the end of second year and again decreases by 10 % at the end of third year . if the population of the city at the end of third year is 4455 , then what was the population of the city at the beginning of the first year ? 
Options: a ) 5000 , b ) 4500 , c ) 4950 , d ) 1000 , e ) 2000
Output (English): a