DEF Enterprises has $800,000 for capital expenditures and is evaluating six projects. The company's required rate of return is 9%.

• Project Alpha: Investment: $200,000, NPV: $30,000, IRR: 11%
• Project Beta: Investment: $250,000, NPV: -$10,000, IRR: 7%
• Project Gamma: Investment: $150,000, NPV: $20,000, IRR: 10%
• Project Delta: Investment: $300,000, NPV: $40,000, IRR: 12%
• Project Epsilon: Investment: $100,000, NPV: $15,000, IRR: 9.5%
• Project Zeta: Investment: $200,000, NPV: $25,000, IRR: 10.8%

Requirements:

1. Determine which projects to undertake without exceeding the budget.
2. Compute the aggregate NPV of the chosen projects.
3. Evaluate the opportunity cost in terms of market value.