You have been offered a unique investment opportunity. If you invest $8,400 today, you will receive $420 one year from now, $1,260 two years from now, and $8,400 ten years from now. a. What is the NPV of the opportunity if the cost of capital is 5.2% per year? Should you take the opportunity? b. What is the NPV of the opportunity if the cost of capital is 1,2% per year? Should you take it now