For this problem, I was asked to calculate the depreciation. But I dont know what to do now. Can you explain what I need to do for this question?

The picture below is needed part of the problem.

The question to this problem is "A decision was made to change depreciation methods for the computer equipment. The change will be effective for 2017. The firm will switch from the Straight-line method to the Double declining balance method depreciation with a 5-year remaining life (as of 1/1/17). The computers were purchased in January of 2016 for $60,000. They were being depreciated over 6 years with no salvage value. Salvage value is now estimated to be $5,000. Note that 2017 depreciation has already been recorded using the straight-line method."

Tomco Inc. prepared an adjusted trial balance as of December 31, 2017. Below, you will find therelevant portions of that trial balance: Accounts Debits