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Muppers3262

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Oct 13, 2005
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I have completed this math problem which states:

No income tax is due on the interest earned in some types of investments. You deposit $25,000 into an account. Which plan produces a larger balance in 40 years (after taxes)?
(a) Tax-Free: The account pays 5% compounded annually. There is no income tax due on the earned interest.
(b) Tax-Deferred: The account pays 7% compounded annually. At maturity, the earned interest is taxable at a rate of 40%.

I did the problem out by hand, but I also need to graph it on my calculator, but I don't know what my windows should be and how I would prove that the two amounts are true on the calculator. Please help if able to do so, I tried to plug in the equation and fixing my windows, but I never get the whole graph for both equations.


This is what I got for (a).
A= P(1+r/n)^nt
A= $25000 (1+ .05/1)^(1*40)
A= $175,999.72

This is what I got for (b).
A= P(1+r/n)^nt
A= $25000 (1+ .07/1)^(1*40)
A= $374,361.45
Final Amount= $374361.45 - (.4*374361.45)
Final Amount= $224,616.87

This would make the tax-deferred plan a better investment than the tax free plan. I'm sorry this is so long. Thank you for your help! :)
 
No worries. You just missed one piece.

In your Tax-Deferred example, you calculated tax on the initial deposit. This puts you off by $25000*0.4 = $10000
 
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