A small town in Florida is considering hiring an orchestra to play in the park during the year. The music from the orchestra is nonrival and nonexclusive. A careful study of the town's music tastes reveals two types of individuals: music lovers and intense music lovers. If forced to pay for an outdoor concert, the demand curve for music lovers would be Q1 = 100 - (1/20)P1 , where Q1 is the number of concerts that would be attended and P1 is the price per (hypothetical) ticket (in dollars) to the concert. The demand curve for intense music lovers would be Q2 = 200 - (1/10)P2 . Assuming the marginal cost of a concert is $2800, what is the efficient number of concerts to offer each year?