Intermediate accounting

Straight-line method 30 year life, no salvage value

At the end of year adjustments to the Trail balance on my worksheet

Debit building $900

I was thinking I take 900 x 12- what over 30 years???

Credit Accumulated depreciation $260

What adjustment for accumulated depreciation on the adjustment entry credit to how much?

What would be the adjusted entry for credit to depreciation expense that you would post?

How did you figure out this entry.