You are investing money at 5.7 percent annual interest, compounded continuously. It will take you how many years to double your investment?

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- November 6th 2009, 07:00 PMthebristolsoundCompound interest problem
You are investing money at 5.7 percent annual interest, compounded continuously. It will take you how many years to double your investment?

- November 6th 2009, 07:34 PMProve It
- November 6th 2009, 08:31 PMthebristolsound
I got the answer 12.5038 and it wasn't quite correct, did I miss a step somewhere?

- November 6th 2009, 09:04 PMProve It
It asks you for a whole number of years.

So if it's a little more than 12... - November 6th 2009, 09:13 PMthebristolsound
It actually asks me to be within one tenth of one percent so 3 numbers beyond the decimal point. I'm sorry for not specifying that. Did I just miss something in my calculations?

- November 6th 2009, 09:21 PMProve It
Can't you round this to 3 decimal places?

. - November 6th 2009, 09:28 PMthebristolsound
Yeah, it's an online homework problem and the system isn't accepting it, for some reason

WeBWorK : math1050fall2009-1 : 9 : 1

I don't know if you can access that, but thank you so much for the help - November 6th 2009, 09:31 PMProve It
What does it mean by "compounded continuously?"

How often does it get compounded... I assumed that it was every year, since the interest rate is given per year, but the wording makes me think otherwise... - November 6th 2009, 09:35 PMthebristolsound
I'm going to try and use the formula A = Pe^rt I think this is what it's looking for

- November 7th 2009, 03:08 AMGuess992
Continuous interest is calculated using

@Prove It

Continuous interest is basically compounded interest that is compounded over such small periods of time, that it is continuous. - November 7th 2009, 03:41 AMProve It
Yes, I just did some research on that.

It seems that when the number of times the interest is compounded , the interest tends to

. - November 7th 2009, 08:46 AMthebristolsound
Thanks guys, after finding out that formula I was able to solve it like this

if money is invested at http://webwork1.math.utah.edu/webwor...da050b4dd1.png percent and compounded continuously, then the factor http://webwork1.math.utah.edu/webwor...ebc71269f1.png multiplying the initial investment after http://webwork1.math.utah.edu/webwor...5b59f2bc11.png years is given by To find the time at which the initial investment is doubled we solve the equation Taking the natural logarithm on both sides and dividing by http://webwork1.math.utah.edu/webwor...79cb7891c1.png yields which with our value of http://webwork1.math.utah.edu/webwor...bfa28ecf81.png percent gives a value of - December 11th 2009, 02:41 PMPannoowau
Still didn't invested but in plane to invest.....

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