Color of Diff Oil. I replaced my differential fluid at 60k miles, I'm now at 71k and today when getting my oil changed the guy showed me the oil and it was dark brown in the rear while the front was still the clearish-yellow like it was when I put them in.
The average tax rate is the tax rate you pay when you add all sources of taxable income and divide that number into the amount of taxes you owe. In other words, you can calculate your average tax rate by dividing your total tax obligation by your total taxable income.
(The average tax rate for those in the lowest income tax bracket is 10.6 percent, higher than each group between $10,000 and $40,000. This is likely because the amount of refundable tax credits is much smaller for the income group that makes under $10,000.).