The government is considering two designs to build a new wind power plant. Design A costs $11 billion to construct. Design A will produce $25 billion worth of power, and will require $4 billion in operating and maintenance costs. Design B costs $13 billion to construct. Design B will produce $29 billion worth of power, and will require $6 billion in operating and maintenance costs. If you can only recommand one choice, which option is better? Why?