Question

On January 1, 2010, Chessville has a population of 50,000 people. Chessville then enters a period of population growth. Its population increases 7% each year. On the same day, Checkersville has a population of 70,000 people. Checkersville starts to experience a population decline. Its population decreases 4% each year. During what year will the population of Chessville first exceed that of Checkersville?

Answer 1

50,000 + 0.07*50,000*x >= 70,000 - 0.04*70,000*x
Solve for x and round it up to the next natural number.
The year in which the population of Chessville will first exceed that of Checkersville will be 2010+x.