Answer:
--New York has a density of millionaires more than twice that of the country as a whole.
Step-by-step explanation:The density of millionaires in the whole US is
9 / 313 = 0.02875 = 2.88% of the people in the US are millionaires
The density of millionaires in New York City is
727,100 / 8,336,697 = 0.0872 = 8.71% of the people in New York are millionaires