first because today's rates are INclusive and second because it's harder to figure today's rate as exclusive.
That's because before you can do your calculation you first have to know what the true income tax rate is.
Second you're "exclusive income tax rate" isn't calculated from your gross income. The sales tax is paid from gross income...No comparison there.
The result of your calculation for your bogus rate is a percentage of (of = muliplied times) already taxed adjusted gross income. Conversely if the "exclusive income tax rate" is a tax on it would be a rate ON after tax income.
Not only is your calculation for "exclusive income tax rate" not a comparable rate. It isn't a "tax rate" by any definition of tax.
You're getting into math again. Fool.
You're babbling again and embarrassing your partners in crime (the SQL crowd).
Better go take your mdedications.