Society is made up of two individuals, Bert and Ernie, whose demands for public good A are given in Figure 1. Assuming that the public good can be produced at a constant marginal cost of $7, what is the optimal level of output? How much would you charge Bert and Ernie? 

Figure 1

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Price (S) Price (S) 25 10 Bert's Demand Da 50 Q =50-2 P Ernie's Demand DE 50 Q =50-5P