30 3.125 points Carson Supply bought equipment at a cost of $72,000 on January 2 2018. It originally had an estimated life of ten years and a salvage value of $12.000. Carson uses the straight-line depreciation method. On December 31, 2021. Carson decided the useful life likely would end on December 31, 2026 (so six more you need to be recorded depreciation was last recorded on December 31, 2020), with a salvage value of $8,400. The depreciation expense recorded on December 31, 2021 should be $8.000, $9.000 $9.600 $7,600