Source: US Census. The median household income in the US is $50,502. This is some extremely useful data given that it is exploring over 114 million US households. If you want to know how most Americans are living this is a good figure to base your assumptions.
The myth that you have to wait 30 minutes or even an hour until you can swim after eating has been conventional wisdom for some time. The simple fact is, however, that swimming on a full stomach does not significantly impact your ability to swim.
A person should wait at least two weeks after getting a tattoo before going swimming, according to About.com. There should be no more peeling or flaking, and all scabs should be gone. In addition, the wearer should clean the tattoo after emerging from the water.