Equipment was acquired on January 1, 2019, at a cost of $90,000. The equipment was originally estimated to have a residual value of $5,000 and an estimated life of 10 years. Depreciation was recorded using the straight-line method. On December 31,2021 the estimated residual value was revised to $10,000 and the usefut life was revised to a total of 5 years remaining from this point on