These accounts represent the actual cost of the articles described, less an annual depreciation at the rate of 15% on the outstanding balances. The amount of depreciation is frequently a matter of argument between the owners and the auditors. Where the item covers such articles as typewriters, adding machines, etc., probably 25% would be a fair proportion; on the other hand, where the principal items are solid fixtures, safes, etc., 15% seems to be a reasonable amount.