Oregon is considering requiring a certain percentage of energy to come from renewable sources. What is the optimal percentage to require? Select the best answer.

Answer $2$ Points

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Requirement: $30\%$ from renewable sources

Total Benefit: $399$

Total Cost: $486$

Requirement: $10\%$ from renewable sources

Total Benefit: $165$

Total Cost: $452$

Requirement: $40\%$ from renewable sources

Total Benefit: $960$

Total Cost: $689$

Requirement: $20\%$ from renewable sources

Total Benefit: $249$

Total Cost: $483$