Texas Instruments TI-82 STATS Manual Book page 339

Procedure
(continued)
Now compare the graph of the amount of interest with the graph
of the amount of principal for each payment.
4. Press z. Set
5. Press o. Turn off all functions and stat plots. Enter these
equations and set the graph styles as shown.
Note: and
GPrn(
menu.
6. Press p. Set these window variables.
Tmin=1
Tmax=360
Tstep=12
Tip: To increase the graph speed, change
7. Press r. After the graph is drawn, press
move the trace cursor to
years of payments.
The graph shows that for the 240th payment (
of the 800 payment is applied to principal (
Note: The sum of the payments (
and .
Par Simul
are located on the
GInt(
Xmin=0
Xmax=360
Xscl=10
, which is equivalent to 20
T=240
Y =Y
3T
FINANCE CALC
Ymin=0
Ymax=1000
Yscl=100
Tstep 24
to .
Í to
240
), 358.03
X=240
).
Y=358.03
+Y
) is always 800.
1T 2T
Applications 17–19