(1) Depreciation for 2018 was found to be understated by $119400. (2) A strike by the employees of a supplier resulted in a loss of $92400. (3) The inventory at December 31, 2018 was overstated by $156900. (4) A disposal of a component of the business resulted in a $2000000 loss. The effect of these events and transactions on 2020 net income net of tax would be