A small city had a population of 120,000 in 2010. Concerned about rapid​ growth, the residents passed a growth control ordinance limiting population growth to 1.8​% each year. If the population grows at this 1.8​% annual​ rate, what will the population be in​ 2020? What is the maximum growth rate cap that will prevent the population from reaching 170,000 in​ 2025?