# Exponential growth and decay by percentage

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##### Examples

###### Lessons

- exponential growth/decay by percentage

The population of rabbits is increasing by 70% every 6 months.

Presently there are 500 rabits. How many years will it take for

the population to reach 1,000,000?

- exponential growth/decay by percentage

The intensity of light is reduced by 2% for each meter that a diver

descends below the surface of the water. At what depth is the intensity of

light only 10% of that at the surface?