A company is considering two mutually exclusive projects Adept and Boffo. Project Adept requires an initial investment of $100,000 and is expected to generate after-tax cash flows of $45,000 per year for three years. Project Boffo requires an initial investment of $150,000 and is expected to generate after-tax cash flows of $50,000 per year for four years. The appropriate discount rate is 10 percent. What is the crossover rate for projects Adept and Boffo?

a)4.06%

b)7.77%

c)12.59%

d)16.65%