How do you solve question 29?

monopoly output and sell at the monopoly price. Duopoly 29. A monopolistic competitor has the following information about cost and demand. If this industry was perfectly competitive, what price would the good sell for? A. $15 B $19 C$21 D$23 Quantity Price ($) Total Marginal Total Cost Marginal Average Revenue Revenue ($) Cost ($) Cost ($) or ($) ($) 0 25 0 25 30 2 24 48 23 35 2.5 17.5 4 23 92 21 45 5 11.25 6 22 132 19 60 7.5 10 8 21 168 17 77 8.5 9.63 10 20 200 15 100 11.5 10 12 19 228 13 126 13 10.5 14 18 252 11 165 19.5 11.79 16 17 272 9 210 22.5 13.13 18 16 288 7 260 25 14.44 20 15 300 5 320 30 16