Problem in depreciation question important, question, maintain, replace, company

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Guys how to solve this question
Destruction Ltd purchased a machine for 80,000.The machine useful life is 8 years and salvage value is 8000. In order to maintain the machine , company will have to replace one its important components every 3 years.The component cost is 6000…
Given that the company replaced the part at end of the 3rd year, amount of depreciation in 4th year will be closest to if it does not use component method
a) 9000
b) 11000
c)12000