Knowing about economic equivalence, someone asks you what one payment in year 4 could you make that would be economically equivalent to all the cash flows below at 6.9% interest? See Excel for Image 300 300 300 250 250 200 200 200 200 150 50 0 1 2 3 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 8 9 10