Okay, I don't get the math.

If a 1% tax costs $10 monthly per average resident, then the full State/City tax rate (4.5% State, 3.875% City) of 8.375% costs the average resident $83.75 a month. To get to that number in State/City taxes, the average resident would have to make $1,000 of taxable purchases monthly... for a family of three $3,000 in monthly or $36,000 in annual purchases that are subject to sales tax (which excludes mortgage payments, auto payments, etc.). This seems way high and there's no way this makes sense if you are looking only at personal, individual, taxpayers.