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7 September, 02:12

Carmen needs $3560 for future project. She can invest $2000 now at annual rate of 7.8%, compound monthly. Assuming that no withdrawals are made, how long will it take for her to have enough money for her project?

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Answers (2)
  1. 7 September, 03:18
    0
    I'm not sure I think it's 10
  2. 7 September, 04:06
    0
    7.42 years (7 years 5 months)

    Step-by-step explanation:

    The future value of Carmen's account can be modeled by

    FV = P (1 + r/12) ^ (12t)

    where P is the principal invested, r is the annual rate, and t is the number of years.

    Solving for t, we have ...

    FV/P = (1 + r/12) ^ (12t)

    log (FV/P) = 12t·log (1 + r/12)

    t = log (FV/P) / (12·log (1 + r/12))

    For FV = 3560, P=2000, r = 0.078, the time required is ...

    t = log (3560/2000) / (12·log (1 +.078/12))

    t ≈ 7.42

    It will take Carmen about 7 years 5 months to reach her savings goal.
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