GPM() - Graduated payment mortgage

Under a graduated payment mortgage plan, the payments increase by a fixed percentage at the end of each year for a specified number of years. Thereafter, the payment amount remains constant.

Returns

Double value if successful. If an error occurs, this function returns a zero.

Arguments

Type	Field	Description
double	dPrincipal	Loan principal
double	dInt	Interest percentage per year
double	dIntIncr	Interest percentage increase year-over-year
double	dYrIncr	Total number of years of increasing rates
long	lPeriods	Total number of payments
integer	iPerYr	Number of payments per year
integer	iYr	Payment per period for year: dYr

16 bit DLL declarations

PowerBuilder Function declaration

function double GPM(double dPrincipal, double dInt, double dIntIncr, double dYrIncr, long lPeriods, int iPerYr, int iYr) library "IFL16.DLL"

Visual Basic Function declaration

Declare Function GPM lib "IFL16" (ByVal dPrincipal As Double, ByVal dInt As Double, ByVal dIntIncr As Double, ByVal dYrIncr As Double, ByVal lPeriods As Long, ByVal iPerYr As Integer, ByVal iYr As Integer) As Double

C/C++ Synopsis

#include "function.h"

double GPM(double dPrincipal, double dInt, double dIntIncr, double dYrIncr, long lPeriods, int iPerYr, int iYr)

32 bit DLL declarations

PowerBuilder Function declaration

function double GPM(double dPrincipal, double dInt, double dIntIncr, double dYrIncr, long lPeriods, int iPerYr, int iYr) library "IFL32.DLL"

Visual Basic Function declaration

Declare Function GPM lib "IFL32" (ByVal dPrincipal As Double, ByVal dInt As Double, ByVal dIntIncr As Double, ByVal dYrIncr As Double, ByVal lPeriods As Long, ByVal iPerYr As Integer, ByVal iYr As Integer) As Double

C/C++ Synopsis

#include "function.h"

double GPM(double dPrincipal, double dInt, double dIntIncr, double dYrIncr, long lPeriods, short sPerYr, short sYr)

Example:

dPrincipal	=	50,000
dInt	=	0.125	(12.5%)
dIntIncr	=	0.05	(5%)
dYrIncr	=	5
lPeriods	=	360
iPerYr	=	12
iYr	=	3

Result: $ 494.89