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. 
-Refer to Table 11-6. Suppose the cost to clean the lake is $40 per hour and that the residents have agreed to split the cost of cleaning the lake equally. If it was decided that the lake will be cleaned for the number of hours that maximizes total surplus of Widgetapolis, how much individual surplus will Mary receive in total?
Definitions:
Vascular Cambium
A layer of plant tissue located between the xylem and the phloem in the stems and roots of vascular plants, responsible for secondary growth and producing new transport cells.
Sclerenchyma
Sclerenchyma is a type of plant tissue characterized by thick, lignified cell walls that provide support and strength to the plant structure.
Annual Rings
Annual rings are layers of growth found in the cross-section of tree trunks, representing one year of growth, and can be used to estimate the age of a tree.
Summer Rings
Annual growth rings found in trees in temperate zones that are typically larger and lighter in color, reflecting faster growth during the summer months.
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