And the principal payment is. Notice the small box next to the N value indicating that you solved for that variable. Here the meaning of various notations are N is time I is the percentage PV is present value PMT is payment FV is future value and CY is compounding period.
All you have to do is enter 9 into I -1250 into PV and 2500 into FV.
Simple interest does not include the effect of compounding. All you have to do is enter 9 into I -1250 into PV and 2500 into FV. R Rate of Interest per year in decimal. FV Final value or ending amount of a loan investment etc.