Final answer:
If Hester leaves 500 fish in the hatchery this year, she will have 1000 fish at the end of next year.
Step-by-step explanation:
To determine the expected number of fish that Hester will have at the end of next year if she leaves 500 fish in the hatchery this year, we can use a simple mathematical model. We know that for every fish she leaves in the hatchery this year, she will have two fish at the end of next year. So if she leaves 500 fish in the hatchery, she will have 500 x 2 = 1000 fish at the end of next year.