# Problems using exponents

Here are some more problems using the exponential formulation:

- How much is a $26,000 retirement account worth after 40 years if it grows
at 1%?

at 5%?

at 6%?

- How many fruit flies do I have if I buy bananas (and 6 flies) on December 10th, but don't start zapping fruit flies until the day after Christmas (December 26th; growth rate = 30%)?:
- Find out how much that $159 iPod will cost if you put it on your credit card and don’t pay anything for 10 years (19% interest)?
- In 2008, the world’s population was about 7 billion. Given current world population growth rate of 1.2%, what will population size be in 40 years? .

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