A company is deciding whether or not to develop a mine site. It will take a capital investment of $14,000,000 to start mining production. The mine is expected to produce $3,400,000 from the ore each year for 10 years. At the end of 11 years, an expenditure of $6,400,000 will be needed to bring the site to environmental standards. If the company wishes to earn 20% p.a. what should they do?