Project-Based Costs of Capital 19. RiverRocks (whose WACC is 12%) is considering an acquisition of Raft Adventures (whose WACC is 15%). What is the appropriate discount rate for RiverRocks to use to evaluate the acquisition? Why? 20. River Rocks' purchase of Raft Adventures (from Problem 19) will cost $ 100 million, and will generate cash flows that start at $15 million in one year and then grow at 4% per year forever. What is the NPV of the acquisition