need help solving #20

[0. Present Value Calculations (Annultles). For each of the following independent scenarios, use Figure 8.10 in the appendix to calculate the present value of the cash ow described. Round to the nearest dollar. 1. $20,000 will be received at the end of each year for 6 years. The rate is 12 percent 2. $20,000 will be received at the end of each year for 6 years. The rate is 15 percent. 3. $20,000 will be received at the end of each year for 6 years. The rate is 7 percent. 4. $120,000 will be received at the end of each year for 4 years. The rate is 10 percent.