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?
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