project a has an initial cost of $75,000 and annual cash flows of $33,000 for three years. project b costs $60,000 and has cash flows of $25,000, $30,000, and $25,000 for years 1 to 3, respectively. projects a and b are mutually exclusive. the incremental irr is and if the required rate is higher than the crossover rate then project should be accepted. a) 13.94 percent; a b) 12.89 percent; b c) 12.89 percent; a d) 13.94 percent; b e) 15.86 percent; a