4) The Budwell & Son Oil Company is looking at two drilling proposals. One project lasts for three years, costs $20M to start, pays back quickly, and has an NPV of $15M. The other project also costs about $20M to start, but has an expected life of seven years, takes much longer to pay back, and has an NPV of $17M. Mr. Budwell, the company's founder, favors the shorter project because of the quick investment recovery. His son Billy, however, has taken finance in college and insists that the only way to judge projects is on NPV. He therefore favors the longer project. They've engaged you as their financial advisor to settle the issue. How would you advise them?