Machinery purchased for $66,600 by Whispering Co. in 2016 was originally estimated to have a life of 8 years with a salvage value of $4,440 at the end of that time. Depreciation has been entered for 5 years on this basis. In 2021, it is determined that the total estimated life should be 10 years with a salvage value of $4,995 at the end of that time. Assume straight-line depreciation. (a) Prepare the entry to correct the prior years' depreciation, if necessary. (If no entry is required, select "No entry" for the account titles and enter 0 for the amounts. Credit account titles are automatically indented when amount is entered. Do not indent manually.) Attempts: 1 of 2 used Using multiple attempts will impact your score. 20% score reduction after attempt 1 (b) Prepare the entry to record depreciation for 2021. (If no entry is required, select "No entry" for the account titles and enter 0 for the amounts. Credit account titles are automatically indented when amount is entered. Do not indent manually. Use Machinery related account.)