Posted by katie on Friday, September 2, 2011 at 4:48pm.
What you probably did was calculated simple interest for 15 years on $1000 and added to $2200 to give $2650.
Compound interest formula are based on the number of periods, n, the interest was compounded.
The interest being compounded 4 times a year, so there are 15*4=60 periods of 3 months each. The corresponding interest rate for each period is therefore r = 3%/4=0.0075.
The formula for the future value using compound interest is:
FV = Principal * (1+r)^n
=2200*1.0075^60
=2200*1.565681
=$3444.50
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