Post date: Apr 10, 2013 3:18:18 PM
Check out these links if you could benefit from some extra help!
http://www.webmath.com/simpinterest.html
http://www.mathsisfun.com/money/interest.html
https://www.khanacademy.org/science/core-finance/interest-tutorial/interest-basics-tutorial/v/introduction-to-interest