Applications 17–19
82501F~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:49 PM Printed: 10/27/05 3:04
PM Page 19 of 20
Now compare the graph of the amount of interest with the graph
of the amount of principal for each payment.
4. Press z. Set
Par and Simul.
5. Press o. Turn off all functions and stat plots. Enter these
equations and set the graph styles as shown.
Note: GPrn( and GInt( are located on the FINANCE CALC
menu.
6. Press p. Set these window variables.
Tmin=1 Xmin=0 Ymin=0
Tmax=360 Xmax=360 Ymax=1000
Tstep=12 Xscl=10 Yscl=100
Tip: To increase the graph speed, change Tstep to 24.
7. Press r. After the graph is drawn, press 240 Í to
move the trace cursor to
T=240, which is equivalent to 20
years of payments.
The graph shows that for the 240th payment (X=240), 358.03
of the 800 payment is applied to principal (
Y=358.03).
Note: The sum of the payments (Y3T=Y1T+Y2T) is always 800.
Procedure
(continued)
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