Give the step-by-step reasoning process and then the final answer. Next year, there will be twice as many people going to the fair as are going this year, and the number of people who went to the fair last year was 200 less than those going next year. If the number of people going to the fair this year is 600, calculate the number of people at the fair in the three years.
If there are 600 people at the fair this year, the number going to the fair next year is 2 * 600 = 1200. The number of people at the fair this year and the ones going next year totals 1200 + 600 = 1800. The number of people who went to that fair last year was 200 less than those going next year, meaning there were 1200 - 200 = 1000 people at the fair last year. In the three years, the number of people at the fair will be 1800 of this and next year + 1000 of last year = 2800.
The final answer: 2800.