Posted by LaCresha on .
2,100 LOAN AT 13% ADD ON INTEREST FOR 3 YEARS. HOW DO I CALCULATE THE APR?

MATH 
PsyDAG,
First, please do not use all capitals. Online it is like SHOUTING. Not only is it rude, but it is harder to understand. Thank you.
http://en.wikipedia.org/wiki/Annual_percentage_rate