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brilliants [131]
3 years ago
5

Suppose you have $12,000 to invest. If part is invested at 10% and the rest at 15%, how much should be invested at each rate to

yield 12% on the total amount invested?
Mathematics
1 answer:
Ivahew [28]3 years ago
3 0
X=invested at 10%12000-x=invested at 15% .10x+ (.15)(12000-x)=1440 ;; 12% of the total amount is 12% of $12000. .10x + 1800-.15x=1440
-0.05x=-360x=7200 12000-x=4800 $7200 at 10%=$720$4800 at 15%=$720 That is $12000 earning $1440, and that is 12%
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Suppose you need some fast cash until payday which is two weeks away. You decide to take out a payday loan for $400 with a fee o
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The  APR on the loan will be $13. The APR is found by the standard formula. It is calculated annually.

<h3>What is APR? </h3>

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Therefore, the derivative of the function is:

f'(x)=1-\frac{1}{x^{2}}

I hope it helps you!  

 

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