Mr. Smith takes his wife, his parents, and his 3 children to a seafood buffet. The price for the adult buffet is $30. The price for the children’s buffet is $15. Senior citizens get a 10% discount. How much does Mr. Smith spend on the buffet for his entire family? 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
The buffet cost for Mr. Smith and his wife is $30 x 2 = $60. The buffet cost for his children is $15 x 3 = $45. The buffet cost for 1 senior citizen is $30 x 90% = $27. B. uffet cost for the grandparents is $27 x 2 = $54. Buffet cost for the entire family is $60 + $45 + $54 = $159.
The answer: 159.