compund interest
posted by thara .
Payments of $1800 and $2400 weere made on a $10,000 variablerate loan 18 and 30 months after the date of the loan. The interest rate was 11.5% compounded semiannually for the first two years and 10.74% compounded monthly thereafter. What amount was owed on the loan after three years?

I answered a similar question two days ago. See
http://www.jiskha.com/display.cgi?id=1249196489