19 percent according to wikipedia in 2006
http://en.wikipedia.org/wiki/Household_income_in_the_United_States
About 25%, see related link.
Fifteen percent
4/10ths of 1 %
1,228,026.2 Americans
Almost all working Americans do. Since a typical working lifespan is around 40 years, that implies only about 5,000 per year on the average.
over 40%
15
less than 31 percent of all americans make $50000
70%
100,000,000 at 5% would earn 5,000,000 intrest.
About five percent of Americans earn 180,000 or more a year. Source: My Budget 360 (see the link below) This is an interesting page, by the way, you might want to check it out.
17 %