18. Diane Van Os decided to buy a new car since her credit union was offering such low interest rates. She borrowed $9,000 at 3.5% on December 26, 2012, and paid it off February 21, 2014. How much did she pay in interest using exact interest? Dic 26, 2012 Feb 21, 2014 I=prt 5 Then do calculations 19000 x .035 x422/305-49,19 15-201 345-20 31-J 21- Calculate the principal, rate, or time given the interest and the other two variables