Question

Briana invests $3,500,at 12% interest,compounded quarterly for 1 year.Manually calculate the compound interest for this investment.

Answer 1

https://qrc.depaul.edu/StudyGuide2009/Notes/Savings%20Accounts/Compound%20Interest.htm

Answer 2

It would be
3,500 * (1+ (.12/4))^4
(the 4 is due to quarterly compounding)
3,500* (1.12550881) =
3,939.280835 and rounding
3,939.28

Calculator to check the answer
http://www.1728.org/compint.htm

Answer 3

I visited the depaul link posted above by SolomonZelman
If you want to see a formula with a worked out example, click here:
http://www.1728.org/compint3.htm