What rate of depreciation do you want? Do you want it to depreciate 20% per year? Then it's 12000 - (12000 X .20[2400]) =9600 then the next year is 9600 - (20% X 9600 [1920]) = 7580 and so on.
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming ...."WOW! What a ride!!!!!"
LUNCH with THEOLDMAN...On a break for now...