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Home > CC3 > Chapter 8 > Lesson 8.2.3 > Problem 8-90


Mary wants to have to travel to South America when she is . She currently has in a savings account earning annual compound interest. Mary is now.

  1. If Mary does not take out or deposit any money, how much money will Mary have when she is ?

    Formula for compound interest:


  2. Will Mary have enough money for her trip when she is ?

    Find how much money Mary will have in years.

    Is this amount enough?

    Use the formula in (a).

  3. If Mary were to graph this situation, describe what the graph would look like.

    Is the amount of money Mary has increasing or decreasing? In what way is it doing so?