A book company sells approximately 9,000,000 paperback books per year. Sales for the
entire paperback book market total approximately 30,000,000 books per year. What is
the company's market share of paperbacks? Explain your answer.
The market share is given by the amount of books sold by a single company relative to the books sold by the entire market. That's why you need to divide 9,000,000 with 30,000,000.