Gopal was a shepherd. He had 8 dozen goats with him at the beginning of 2002. Every year from then on, he bought x % (x > 0) of his goats at the beginning of the year and sold y% (y > 0) of his goats at the end of that year. At the end of 2003 after selling y% of his goats he had 9 dozen goats with him. Which of the following always can be concluded?