Problem: What is the Present Value of the following annuities?
1. $2,500 a year for 10 years discounted back to the present at 7 percent.
2. $70 a year for 3 years discounted back to the present at 3 percent.
3. $280 a year for 7 years discounted back to the present at 6 percent
4. $500 a year for 10 years discounted back to the present at 10 percent