Answer:
53%
Explanation:
The computation of the four-firm concentration ratio for an industry is shown below:
= 20% + 12% + 11% + 10%
= 53%
We simply added the top four ratios so that the four firm concentration ratio could come
ANd, the other given percentage would be ignored as it shows the less distribution of sales as compares to the top one
Hence, the ratio is 53%