# Calculate the IRR of this investment

You are considering investing in a new gold mine in South Africa. Gold in South Africa is buried very deep, so the mine will require an initial investment of \$250 million. Once this investment is made, the mine is expected to produce revenues of \$30 million per year for the next 20 years. It will cost \$10 million per year to operate the mine. After 20 years, the gold will be depleted. The mine must then be stabilized on an ongoing basis, which will cost \$5 million per year in perpetuity.

Calculate the IRR of this investment. (Hint: Plot the NPV as a function of the discount rate.)

You have just been offered a contract worth \$1 million per year for five years. However, to take the contract, you will need to purchase some new equipment. Your discount rate for this project is 12%. You are still negotiating the purchase price of the equipment.

What is the most you can pay for the equipment and still have a positive NPV?

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