Krystal Lott answered question 9/16/2010 Mathematics Question: Maryam pays $3000 on the 30th day of a $7,000, 120-day, and 8% loan. What is the adjusted principal after the partial payment is made if ordinary interest is applied? Why are you asking questions that sound like your homework because if it is your homework you will just get more idiotic if you don't do it yourself. Believe me... I have a company and am millionaire and I didn't get this way from slacking off.