Answer:
829.34
The market structure is not concentrated
0.48
Explanation:
The HHI is calculated by squaring the market share of each firm in the industry and then adding the squares together.
20.7² + 17² + 6.7² + 3.6²+ 2² + 50(1²) = 428.49 + 289 + 44.89 + 12.96 + 4 + 50 = 829.34
The market structure is not concentrated because the HHI is less than 100
The four firm concentration ratio calculates the concentration ratio of the 4 largest firms in an industry.
0.207 + 0.17 + 0.067 + 0.036 = 0.48 or 48%
