3. Dolphin, Inc. trains mine-seeking dolphins in a 5-mine tank. The company is considering purchasing a new tank for $750,000; realistic dummy mines cost $105,000 apiece. The U.S. Navy will pay $105,000 for each dolphin trained, and the new tank would allow the company to train 3 dolphins per year. The tank will last 10 years and will cost $50,000 per year to maintain. If the MARR equals 5%, what is the net present value