Wayne Enterprises is considering investing in two projects. The first project is the Tumbler project which is expected to cost $50 million and will result in cash flows of $60 million, $90 million and $20 million at the end of 1st, 2nd and 3rd year. The second project is the Bat project which is expected to cost $80 million, and will result in cash flows of $20 million at the end of 1st year, zero at 2nd year, but it is expected to generate economic benefits of $250 million at the end of 3rd year. Find the crossover rate.