Chapter 11
Practice Worksheet
Directions
: Solve the following problems on a separate sheet of paper. Show all your
work. Circle your answer.
1.
The population of Orangedale is increasing at the rate of 4% per year. The
population in 1990 was 50,000 people. Find the population in 1991, 1992, and
1995, respectively.
2.
If $8000 are invested in an account that pays 5.25% interest compounded
annually. (a) How much will be in the account after 4 years? (b) How long will it
take until the account has $25000?
3.
An investment of $500 increased to $1000 after 12 years. At what rate was the
money invested if the interest was compounded monthly?
4.
A research biologist began to grow a culture in which the number of bacteria
doubled every day. Three days later, she began a second culture in a richer
medium so that the number of bacteria increased fourfold everyday. If each
culture was begun with the same number of bacteria present, how many days
after starting the second culture will the number of bacteria in the two cultures
be equal?
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 Spring '08
 Grether
 biologist, present deer population

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