Texas Instruments TI-84 PLUS - Graphing Calculator User Manual

Chapter 17: Activities 325
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.
8. Press † to move the cursor onto the function for interest defined by X2T and Y2T. Enter 240.
The graph shows that for the 240th payment (X=240), 441.97 of the 800 payment is interest
(
Y=441.97).
9. Press y 5 Œ Í 9 to paste 9:bal( to the home screen. Check the figures from the
graph.
At which monthly payment will the principal allocation surpass the interest allocation?

Texas Instruments TI-84 PLUS - Graphing Calculator Specifications

General

Type	Graphing Calculator
Display Type	LCD
Screen Resolution	96 x 64 pixels
Processor	Zilog Z80
Memory	24 KB RAM, 480 KB Flash ROM
Power Source	4 AAA batteries (with backup lithium battery)
Connectivity	I/O port
Weight	7.4 oz (210 g)
Software	TI-OS (Texas Instruments Operating System)