Regarding silver coins, the America the Beautiful Silver Bullion Coins are made with .999 fine silver. During the U.S. Mint's issuing of normal circulation coinage, every coin (except one) had at least a little bit of copper in it.
Overall Income and Expenses. According to a 2009 United States Department of Labor survey of consumer expenditures, the average American household has 2.5 residents and a household gross income of $62,857. Annual spending totals $49,067.
The average monthly grocery bill for a family of 4 is close to  $400. The price will vary depending upon the ages of the family  members and their eating habits.