Answer:
87 million tickets are sold every year.
Explanation:
Number of Americans attending classical music concerts:
30 million
Average number of times a spectator attends a concert in a year
2.9 times
Then the amount of tickets sold "x" for concerts of classical music in a year, will be equal to the number of people attending for the number of times they attend. So:
Where "x" is given in units of millions.