help please

On Jan 1, 2017, Aone industries placed into service a refrigeration unit that had a capitalized cost of 522,000, a useful life of 12 years, and an estimated salvage value of $1.000 Depreciation expense was calculated as $1.400/yr using straight line depreciation. On Jan 1, 2020, Acme reves the refrigeration units Savage value to $1.500. What is the equipment's remaining depreciable cont after this change