Susan and Stan Williams are a married couple who file joint income tax returns. The income tax table is provided below. Their combined annual income is $350,000 in the previous year. The standard deduction is $25,100 in the U.S. It means that income above the standard deduction is treated as taxable income. If the taxable income Pay below Plus this % on is between: amount on the excess min max the base over the base $0 $19,900 $0 10.0% $19,901 $81,050 $1,990 12.0% $81,051 $172,750 $9,328 22.0% $172,751 $329,850 $29,502 24.0% $329,851 $418,850 $67,205 32.0% $418,851 $628,300 $95,685 35.0% $628,301 $168,992 37.0% and up How much is Williams' average tax rate? Enter your answer in the following format: 0.1234