The marginal benefit received for each gallon of gasoline consumed per week for Ang, Tony, and Gianna is provided in the accompanying table. On the same graph, plot each of their individual demand curves. Assuming these are the only people in the market, graph the market demand curve for gasoline.

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Gallons consumed per week 1 2 3 4 Ang's marginal benefit $7 $5 $3 $1 Tony's marginal benefit $4 $3 $2 $1 Gianna's marginal benefit $8 $6 $4 $2