Based on your successful completion of the first project, the consulting firm has now asked you to analyze another project under consideration. It has an installed cost (at time period zero) of $412,670. The after-tax cash flows over the four-year life of the project are as follows:

Year 1: $212,817,

Year 2: $153,408,

Year 3: $102,389

Year 4: $72,308.

At what discount rate is the NPV equal to zero?