Cause. Hives can also be classified by the purported causative agent. Many different substances in the environment may cause hives, including medications, food and physical agents. In perhaps more than 50% of people with chronic hives of unknown cause, it is due to an autoimmune reaction. Medications
The average American pays almost 30% of their income to taxes. Here's the breakdown. According to the IRS's preliminary data from the 2015 tax year (the returns you filed during 2016), there was a total of $1.454 trillion in income tax owed, which translates to an average effective federal income tax rate of about 13.5% per return.
The United States federal government taxes personal income using graduated scale. Income tax rates begin at 10% and gradually increase to 15%, then 25%, then 28%, then 33%, then 35%, and finally reaching a top rate of 39.6%. Each tax rate applies to a specific range of income. This range is called a tax bracket.