Calculator Techniques: 20-2

DATA	Enter	Compute
P1 =	1
P2 =	180
BAL =		188,441.32
PRN =		(111,558.68)
INT =		(130,925.45)

Obviously, the principal paid and the principal remaining sum to $300,000.00. If it doesn't, double check that you have cleared your calculations before entering new mortgage data, or make sure that you enter FV = 0 when you enter your mortgage data.