Tаble 7-9 Seller Oppоrtunity Cоst fоr Providing 10 Piаno Lessons (Dollаrs) Marcia 200 Jan 250 Cindy 350 Greg 400 Peter 700 Bobby 800 Refer to Table 7-9. The equilibrium market price for 10 piano lessons is $400. What is the total producer surplus in the market?