The owner of a big farm is going to decide on two options of designs to build a new well. The first design costs $10 billion to construct. This design will produce $24 billion worth of water and will require $3 billion in operating and maintenance costs. 

The second design will cost $12 billion to construct. This design will produce$28 billion worth of water and will require $5 billion in operating and maintenance costs. Which design is better? Why?