Problem #2 (Depreciation-Change in Estimate) Machinery purchased for $100,000 by Deer Co. in 2013 was originally estimated to have a life of 10 years with a salvage value of $20,000 at the end of that time. Depreciation has been entered for 5 years on this basis. In 2018, it is determined that the total estimated life should be 9 years with a salvage value of S6,000 at the end of that time. Assume straight-line depreciation Instructions (a) Prepare the entry to correct the prior years' depreciation, if necessary. (b) Prepare the entry to record depreciation for 2018