The cash flows for four projects are shown below, along with the cost of capital for these projects. If these projects are mutually exclusive, which one should be taken?

Year: 0 Cash flow: - $20,000 Cost of Capital: 8.3% 1 $6000 2. $6000 3 $6000 4 $6000 5 $6000 Year: 0 Cash flow: - $15,000 Cost of Capital: 7.4% 1 $4000 2 $4000 3 $4000 4 $4000 5 $4000 Year: 0 Cash flow: - $18,000 Cost of Capital: 7.7% 1 $5000 2 $5000 3 $5000 4 $5000 5 $5000 Year: 0 Cash flow: - $12,000 Cost of Capital: 4.4% 1 $4000 2 $4000 3 $4000 4 $4000 5 $4000