Solve clearly

Table 11-6 Consider the city of Widgetapolis with only four residents, John, James, Mary, and Lydia. The four residents are trying to determine how many hours to spend in cleaning up the public lake. The table below shows each resident's willingness to pay for each hour of cleaning. Hours John James Mary Lydia $30 $50 $40 $10 2 25 40 37 20 30 34 15 20 30 10 25 6 O 15 7 0 0 5 4 Refer to Table 11-6. Suppose the cost to clean the lake is $20 per hour. How many hours should be spent cleaning the lake to maximize total surplus for the residents in Widgetapolis? O 4 hours O 5 hours O 6 hours O 7 hours