Sheridan Company purchased equipment that cost $3225000 on January 1, 2017. The entire cost was recorded as an expense. The equipment had a 9-year life and a $129000 residual value. Sheridan uses the straight-line method to account for depreciation expense. The error was discovered on December 10, 2019. Sheridan is subject to a 40% tax rate.

How can you solve for Sheridan's net income for the year ended December 31, 2017, to find out how much it was understated by?