Refer to the table below, which presents information on a market that provides positive externalities on society. Quantity Marginal cost Private marginal benefit Private+social marginal benefit 6,000 $300,000 $340,000 $360,000 7,000 $310,000 $330,000 $350,000 8,000 $320,000 $320,000 $340,000 9,000 $330,000 $310,000 $330,000 10,000 $340,000 $300,000 $320,000 11,000 $350,000 $290,000 $310,000 Calculate the socially optimal quantity of this good or service