To calculate the payback period (if you have a regular stream of cash inflows), all you need to do is to divide the original investment by the annual cash inflow.

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The payback period, when dealing with a regular (uniform) stream of cash inflows, is calculated by dividing the initial investment cost by the annual cash inflow. This gives the number of years it will take to recover the initial investment.

To Calculate the Payback Period (If You Have a Regular