Philadelphia Company has the following information for March: Sales $486,016 Variable cost of goods sold 202,120 Fixed manufacturing costs 75,931 Variable selling and administrative expenses 50,499 Fixed selling and administrating expenses 37,308 Determine the March: a. Manufacturing margin b. Contribution margin c. Operating income for Philadelphia Company A LA $ LA The level of inventory of a manufactured product has increased by 7,133 units during a period. The following data are also available: Unit manufacturing costs of the period Unit operating expenses of the period Variable Fixed $14.00 $7.00 3.00 2.00 The effect on operating income if absorption costing is used rather than variable costing would be a Oa. $64,197 decrease Ob. $49,931 increase Oc. $49,931 decrease Od. $64,197 increase