The projected cash flows for two mutually exclusive projects are as follows: t= 0 1 2 3 4 5 -150,000 20,000 10,000 0 0 250,000 - 150000 50,000 50,000 50,000 50,000 50,000 The crossover rate is closest___________ a. 5.72% b.6.89% c. 7.21% d. 8.32%