Your total benefits for consuming different quantities of gas each week are shown in the table below. Complete the marginal benefit column starting with the step from 0 gallons/week to 1 gallon/week. Gallons/Week Total Benefit (dollar equivalent) Marginal Benefit O A A N - O 8 A 11 14 16 O - N N W W 18 19 19 The price of gasoline is $2.40/gallon. Given this information, using the Principle of Optimization at the Margin, the optimal number of gallons of gas to consume each week will be