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if you do n=999 i= 6% (annual) p= $250, then compute the PV you will get $4,166.67. However, you need the PV today and not at T= 4 (this is beginning of year 4 or end of year 3). So, change N = 3, FV to $4,166.67, p = 0 and compute PV to get $3,498.42. You’ll soon realize that the CFA will make you take the PV of all future after tax payments; just always have PV of anything on your mind. ðŸ™‚