after taking advantage of all their deductions and personal exemptions, and availing themselves of the provision that allows married couples and the heads of households to be taxed at rates generally lower than those for single persons, ended up paying an average tax bill of about one-tenth of their reportable receipts, while those in the $10,000–$15,000 range paid a bill of about one-seventh, those in the $25,000–$50,000 range paid a bill of not quite a quarter, and those in the $50,000–$100,000 range paid a bill of about a third.
