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Pre Algebra

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I need help figuring out simple interest and the balance of an account. Example P = $525, r = 6%, t + 9 years

  • Pre Algebra -

    The formula for simple interest is,
    I = PRT (Interest = Principle * Rate * Time)

    Balance of account ?
    t + 9 years?

  • Pre Algebra -

    two sums of money totaling 15000 earn 5% and 7% annual interest. if the total interest from both investments amounts to $870, how much is invested at each rate?

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