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Math Help - compounded interest rate

  1. #1
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    compounded interest rate

    A sum of 1600 dollars is deposited in an account with an interest rate of r percent per year, compunded daily. At the end of 7 years, the balance in the account is given by
    A=1600 (1 + r
    36,500
    )2555 .

    dA
    /dr= 112 *(1+r/36,500)^2554


    then If r = 7, then dA/dr= ??? dollars/(one percentage point).
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  2. #2
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    e^(i*pi)'s Avatar
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    Just sub in 7 wherever you see r in dA/dr
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  3. #3
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    ahhhh okay thank you, i dont know why i didnt see that myself!
    thanks again
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