Answer:
A credit of $800
Explanation:
Accumulated depreciation is the total depreciation for a fixed asset that has been charged to expense since that asset was acquired and made available for use.
The accumulated depreciation account is an asset account with a credit balance which means that it is presented on the balance sheet as a reduction from the original cost of fixed assets.
As the accumulated depreciation has unadjusted credit balance of $600, any adjustment in credit column of $200 will make its total to $800 ($600+ $200).
The original cost of the asset less the amount of accumulated depreciation and any impairment is known as its carrying amount.