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Algebra 24 Online
OpenStudy (princessaurora):

** POR FAVOR WILL FAN AND MEDAL** Situation: You invest $900 in an account that pays an interest rate of 5.5%, compounded continuously. Calculate the balance of your account after 6 years.

OpenStudy (anonymous):

Do you know what compound interest is? Can you tell me a formula we can use here?

OpenStudy (anonymous):

I can give a formula.

OpenStudy (anonymous):

A=PE\[A=PE ^{rt}\] - A being amount - P being principal - E being mathematical constant - r being intrest - t being time in years

OpenStudy (princessaurora):

I got 1251.87 is that right?

OpenStudy (anonymous):

Not sure, how did you get that answer. Where did you place the numbers?

OpenStudy (anonymous):

Never used the equation, so...still trying to understand the equation myself right now.

OpenStudy (princessaurora):

Are you doing online school?

OpenStudy (anonymous):

I am.

OpenStudy (princessaurora):

Algebra 2 class? That's what I'm on

OpenStudy (anonymous):

Algebra 1

OpenStudy (princessaurora):

IT WAS RIGHT, THANK THE HEAVENS!

OpenStudy (anonymous):

I got 29,700 can't be right. Here is how I inserted the numbers. \[A=900*1^{5.5*6}=X\]

OpenStudy (princessaurora):

It told me I got it right so I guess I did get it right .

OpenStudy (anonymous):

Lol, alright. As I was saying I am still trying to figure out how you got it right.

OpenStudy (anonymous):

Click equation punch in the numbers and post it. maybe I can get it then.

OpenStudy (princessaurora):

FV=(900)(2.71828)^(0.055*6)

OpenStudy (anonymous):

FV?

OpenStudy (anonymous):

\[FV=(900)(2.71828)^{(0.055*6)}\] How did you get 2.71?

OpenStudy (anonymous):

The numbers were 900/5.5/6 where did 2.71 come from?

OpenStudy (princessaurora):

FV=future value PV=present value r= annual rate of interest (in decimal not percent) t=time in years e=constant, 2.71828

OpenStudy (anonymous):

Ah

OpenStudy (princessaurora):

\[FV=(PV)*(e)^{r*t}\]

OpenStudy (princessaurora):

r*t are in one parenthesis

OpenStudy (anonymous):

So, what is the equation on acquiring the constant.

OpenStudy (anonymous):

David, you made a slight mistake. The interest is 5.5% but as a decimal, that is 0.055 not 5.5. This means that for ever year the interest is added, the principal increases by a factor of 1.055. $900 over 6 years would be \[$900\times1.055^6=$1240.96\]

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