machinery purchased for $66,000 by Windsor Co. in 2013 was originally estimated to have a life of 8 years with a salvage value of $4400 at the end of that time. Depreciation has been entered for 5 years on this basis. In 2017, it is determined that the total estimated life should be 10 years with salvage value of $4950 at the end of that time. Assume straight line depreciation. prepare the entry to correct the prior years depreciation, if necessary.