please help me with the last three questions

The level of inventory of a manufactured product has increased by 8,053 units during a period. The following data are also available: Variable Fixed Unit manufacturing costs of the period $12.00 $8.00 Unit operating expenses of the period 2.00 3.00 The effect on operating income if absorption costing is used rather than variable costing would be a a. 588,583 decrease b. 588,563 increase 564,424 decrease d. 564,424 increase Under which inventory costing method could increases or decreases in operating income be misinterpreted to be the result of operating efficiencies or inefficiencies? a only abortion costing bly variable costing Ce both variable and weption in d. neither variable ho tion coin In the variable costing income statement, deduction of variable selling and administrative expenses from manufacturing margin yields contribution murin to profit marginal expenses d. differential