Wardell Company purchased a mainframe on January 1, 2019, at a cost of $58,000. The computer was depreciated using the straight-line method over an estimated five-year life with an estimated residual value of $16,000. On January 1, 2021, the estimate of useful life was changed to a total of 10 years, and the estimate of residual value was changed to $2,200.

1. Prepare the year-end journal entry for depreciation in 2021. No depreciation was recorded during the year. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field. Round your final answer to nearest whole dollar.)

Please show you how you did it.

General journal:

Debit Depreciation expense

Credit Accumulated depreciation-computer

I tried these answers: 4200 and 525. They were both wrong, so I don't know how to figure it out correctly.