Treatment of accounting errors, changes in accounting principles, and changes in accounting estimates. A firm computes net income for 2008 of $1,500 and for 2009 of $1,800, its first two years of operations. Before issuing its financial statements for 2009, the firm discovers that an item requires an income-reducing adjustment of $400 after taxes. Indicate the amount of net income for 2008 and 2009 assuming (1) the item is an error in the computation of depreciation expense for 2008 (2009 depreciation expense is correct as computed), (2) the item is the change in net income for 2008 as a result of adopting a new method of accounting for stock options in 2009(2009 stock option expense reflects the new accounting principle), and (3) the item is the change in estimated uncollectible accounts for 2008 as a result of worsened credit losses experienced in 2009; the firm included the adjustment amount in bad debt expense for 2009.