90- 85- 80- 75- 70- 65- Society is made up of two individuals, Bert and Ernie, whose demands for public good A are given in the figure on the right. Bert's demand is: 110- 105 DE 100- 95- Q = 50 -1.0PA Ernie's demand is: Q = 50 -0.5PA Assume that the public good can be produced at a constant marginal cost of $4. The optimal level of output is ☐ units. (Round your response to the nearest integer.) Price ($) 60- 55-DB 50- 45- 40- 35- 30- 25- 20- 15- 10- 5 어 -O 0 20 30 40 50 Units of output, QA 725 Lo 10 -0 60 te 70 80