19 percent according to wikipedia in 2006
http://en.wikipedia.org/wiki/Household_income_in_the_United_States
Fifteen percent
About 25%, see related link.
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.
17 %
less than 40 percent