What Is the Four-Firm Concentration Ratio If the Four Largest

Multiple Choice

What is the four-firm concentration ratio if the four largest firms in an industry account for 5 percent,6 percent,7 percent,and 8 percent of total revenue?

A) 26 percent
B) 174 percent
C) 1,680
D) There is enough information given to answer the question, but none of the answers above is correct.
E) There is not enough information given to answer the question.