Ernst Company purchased equipment that cost $750,000 on January 1,2010. The entire cost was recorded as an expense. The equipment had a nine year life and a $30,000 residual value. Ernst uses the straight-line method to account for depreciation expense. The error was discovered on December 10,2012. Ernst is subject to 40% tax rate. Before the correction was made and before the books were closed on December 31,2012, retained earnings was understated by a) $354,000 b) $450,000 c) $332,000 d) $336,000