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Question: i found the answer to number 11 which is c...

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11. Suppose that a perfectly competitive market is described by the following demand and supply equations QD 10-P What is the equilibrium price in this market? A. $2 $3 C.S4 D.S5 E. S6 12. Suppose that a perfectly competitive market is described by the following demand and supply equations Q-10-P What is the value of total social surplus (consumer and producer surplus) in this market in equilibrium? A. 9 B. $18 C. S27 D. S36 E. S54I found the answer to number 11, which is C $4, however I am not sure how to find the answer to number 12.

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