The net cash flows from an investment project are -$30,000 in the first year, -$20,000 in the second year, -$6,000 in the third year, $1,500 in the fourth year, $5,000 in the fifth year, $15,500 in the sixth year, and $66,000 in the 7th year. Calculate the NPV of this project at the following interest rates: 2%, 5%, and 8%. Describe why the NPV changes with dissimilar interest rates