Calculation of average tax rate that will result in a 17 percent increase in tax revenues:
Currently, the average taxpayer in the united states earns $52,000 and pays an average tax rate of 20 percent, so the average tax revenue is 52000*20% = $10,400
If Congress wants to increase tax revenues by 17 percent, then the average tax revenue shall be 10400+(10400*17%) = $12,168
Hence average tax rate that will result in a 17 percent increase in tax revenues shall be = 12168 / 52000 = 0.234 = 23.40%