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September 21, 2014

September 21, 2014

Posted by **James** on Tuesday, April 8, 2008 at 8:22pm.

a. The balance of the account at the end of 20 years

b. the amount of money actually deposited into the account

c. the interest earned during the 20 years.

I think i know that for part a you use the integral to find the future value maybe, but i have no idea how to do b or c

- Calc -
**FredR**, Wednesday, April 9, 2008 at 1:00amcompound interest formula is:

FV=PV(1+(r/n))^(nT)

As n approaches infinity, this formula becomes:

FV=PV*e^(rt)

for the 1st $1000 invested:

FV=1000*e^(.07*20)

for the 2nd $1000 invested:

FV=1000*e^(.07*19)

and so on for 20 years. The sum total of future values minus $20,000 deposited is the interest earned in the 20 years.

- Calc -
**Kati**, Thursday, February 13, 2014 at 12:07ama.) $43,645.71

b.) just do 1000*20 =20,000

c.) a-b (43,645.71-20,000=23645.71)

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