6. We are interested in predicting the population changes among three cities in a country. It is known that in the current year, 20% and 30% of the populations of City 1 will move to Cities 2 and 3, respectively, 10% and 20% of the populations of City 2 will move to Cities 1 and 3, respectively, and 25% and 10% of the populations of City 3 will move to Cities 1 and 2, respectively. Assume that 200,000, 600,000, and 500,000 people live in Cities, 1, 2, and 3, respectively, in the currently year. Find the populations in the three cities in the following year.