Your kidneys are complex organs. They regulate the amount of water lost from the body and get rid of waste products, especially urea. Urea is made when any excess amino acids are broken down in your liver.
Middle Class Income for a Family. The annual average income for a middle class family of four is approximately $70, 354. This is based on a 2006 report by the U.S. Census for a family of four. This figure is in the middle of the range of incomes for this section of the population. The median income during this time for all households was $48,561.
Most middle-class families pay far less than this âaverage burden.â Suppose four families that each have incomes of $25,000 each pay $1,250 in income tax â fivepercent of their income â while one wea lthy family with $500,000 in income pays $125,000 inincome tax, or 25 percent of its income.ost middle-class families pay far less than this âaverage burden.â Suppose four families that each have incomes of $25,000 each pay $1,250 in income tax â fivepercent of their income â while one wea lthy family with $500,000 in income pays $125,000 inincome tax, or 25 percent of its income.