A 100in. tall fruit tree doubles in height each year.
100 people are infected with a virus. Every day, 2 more people are infected.
There are 100 bacteria in a culture. The amount doubles every 5 hours.
There is $100 in a savings account. An additional $100 is added to the account every month.
100 wolves are reintroduced to Yellowstone National Park. Each year, the number of wolves double.