The table has three columns. The first column displays the quantity of water in gallons per day. The second and third columns display the marginal external cost and marginal social benefit in dollars per gallon, respectively. The data from the table is as follows:

10 gallons: 1; 10

20 gallons: 2; 9

30 gallons: 3; 8

40 gallons: 4; 7

50 gallons: 5; 6

60 gallons: 6; 5

70 gallons: 7; 4.

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