Posted by Paisley on Tuesday, March 24, 2009 at 11:49am.
Semiannually means that interest is paid and compounded every six months. The amount added on is 2.5% (1/2 of 5%) each time.
To get the value after five years, multiply by (1.025)^10 = 1.2800845. Note that that is more than 1.25 you would get by not compounding.
You end up with
$53,531.60. That might be a few cents off, depending upon how pennies get rounded off each time.
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