Anadarko petroleum must choose between two mutually oil-drilling projects, which each have a cost of $12 million. under plan A, all oil would be extraced in one year producing a cash flow at t=1 of 14.7 million. under plan B cash flows would be $2.1 million for 20 years. the firms WACC is 12%. at what rate are the NPVs for these two plans the same? that is, what is the crossover rate where the two projects' NPV are equal?