Operation Manual

Chapter 14: Applications 262

bal(

npmt[,roundvalue])

GPrn(, GInt(

GPrn( computes the sum of the principal during a specified period for an amortization schedule using

stored values for ¾æ, PV, and PMT. pmt1 is the starting payment. pmt2 is the ending payment in the range.

pmt1 and pmt2 must be positive integers < 10,000. roundvalue specifies the internal precision the calculator

uses to calculate the principal; if you do not specify

roundvalue, the graphing calculator uses the current

Float/Fix decimal-mode setting.

Note: You must enter values for æ,

PV, and PMT before computing the principal.

Prn(pmt1,pmt2[,roundvalue])

GInt( computes the sum of the interest during a specified period for an amortization schedule using

stored values for ¾æ,

PV, and PMT. pmt1 is the starting payment. pmt2 is the ending payment in the

range. pmt1 and pmt2 must be positive integers < 10,000. roundvalue specifies the internal precision the

calculator uses to calculate the interest; if you do not specify

roundvalue, the TI-84 Plus C uses the

current

Float/Fix decimal-mode setting.

Int(pmt1,pmt2[,roundvalue])

Amortization Example: Calculating an Outstanding Loan Balance

You want to buy a home with a 30-year mortgage at 8 percent APR. Monthly payments are 800.

Calculate the outstanding loan balance after each payment and display the results in a graph and in the

table.

1. Press z. Press † ~ ~ ~ Í to set the

fixed-decimal mode setting to

2. Press † † ~ Í

to select Par graphing mode.

2. Press Œ Í Í to display the TVM Solver.