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Projects A and B are mutually exclusive. Project A has cash flows of -$10,000, $5,100, $3,400, and $4,500 for years 0 to 3, respectively. Project B has cash flows of -$10,000, $4,500, $3,400, and $5,100 for years 0 to 3, respectively. What is the crossover rate for these two projects?