Nine adults went to a play with seven children. Adult tickets are $11 each and children's tickets are $7 each. How many dollars more did the adults' tickets cost in total than the children's tickets in total? Let's be accurate as possible.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Adults = 9 * 11 = 99. Children = 7 * 7 = 49. Difference: 99 - 49 = $50. The adults' tickets cost $50 more than the children's tickets.
The answer: 50.