What percentage of households earn 150000?

The answer is about 8% (of households earn 150,000 +). 20% of households earn 100,000+. This is based on:

Table HINC-06. Income Distribution to $250,000 or More for Households: 2007 [Source: U.S. Census Bureau, Current Population Survey, 2008 Annual Social and Economic Supplement. Numbers in thousands. Households as of March of the following year.]