After 1 year: 100,000,000 x 1.02 = 102,000,000 after 2 years: 102,000,000 x 1.02 = 104,040,000 after 3 years: 104,040,000 x 1.02 = 106,120,800 after 4 years: 106,120,800 x 1.02 = 108,243,216 and after 5 years: 108,243,216 x 1.02 = 110,408,080
Deer and bear population will increase, but the mushroom population will decrease.
Explanation:
The deer will start eating the mushrooms, cutting down the population numbers for that plant and reproducing it's own species. Then the bears will eat the deer, making their population increase as well.