Question: If my car trade in value is $21,000 now, is it valid to depreciate by 0.9875 every month? I am figuring that a car depreciates 15% per yr. it is a 2002 model yr audi. So i did 15%/12 = 1.25%.   1.0-.0125=0.9875.

Answer: Try .9578 and divide by 13 then add 2002 and divide by your birthyear. Add the current temperature and subtract your IQ from the quotient.
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