The top four firms in industry A have market shares of 30, 25, 10, and 5 per cent, respectively. The top four firms in industry B have market shares...

The top four firms in industry A have market shares of 30, 25, 10, and 5 per cent, respectively. The top four firms in industry B have market shares of 15, 12, 8, and 4 per cent, respectively. Calculate the four- firm concentration ratios for the two industries. Which industry is more concentrated?