Answer:
The cheapest city that Jake can remove from his travel plans and still stay under his budget is C. Nanjing
Explanation:
if we add all the totals he has for each city
449(Wuhan)+534(Chengdu)+557(Tianjin)+595(Zhengzhou)+681(Nanjing)+728(Beijing) = 3,544
It can't be A. Tianjin because 3,544-557= 2,987 which is still over his budget.
It can't be B. Wuhan because 3,544-449= 3,095 which is still over his budget.
It can't be D. Beijing because even though 3,544-728=2,816 it is under his budget, the question asks which one is the cheapest city that can be removed and Nanjing is cheaper than Beijing, therefore, the answer is C. Nanjing.