11. (Table: Neighborhood Playground) The willingness to pay for a new neighborhood playground is shown in the table. The marginal cost of providing the playground is MC= 300 + 0.50, where O is square feet. What is the efficient quantity of the good? Square Footage 500 1,000 1,500 Dhaval $100 $ 50 $ 20 Shaheena 125 65 40 Ahpraisja 50 30 10 Emil 133 35 20 Sarinda 75 60 20 Athipong 180 100 80 Artemus 182 140 100 Jerrod 105 100 90 Soheila 150 110 70 Sharif 160 110 50