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The payback for the first project, A, is easily calculated. The sum of the cash flows for the first two years is $70, leaving us with $100 - 70 = $30 to go. Because the cash flow in the third year is $50, the payback occurs sometime in that year. When we compare the $30 we need to the $50 that will be coming in, we get $30/50 = .6; so, payback will occur 60 percent of the way into the year. The payback period is thus 2.6 years.

Project B's payback is also easy to calculate: it never pays back because the cash flows never total up to the original investment. Project C has a payback of exactly four years because it supplies the $130 that B is missing in Year 4. Project D is a little strange. Because of the negative cash flow in Year 3, you can easily verify that it has two different payback periods, two years and four years. Which of these is correct? Both of them; the way the payback period is calculated doesn't guarantee a single answer. Finally, Project E is obviously unrealistic, but it does pay back in six months, thereby illustrating the point that a rapid payback does not guarantee a good investment.

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