please help me out with the last three questions

Spice Inc.'s unit selling price is $47, the unit variable costs are $37, fixed costs are $100,000, and current sales are 9,000 units. How much will operating income change if sales increase by 5,800 units? o. $141,000 increase b. 590,000 decrease Oc. $90,000 increase d. 158,000 increase The level of inventory of a manufactured product has increased by 6,572 units during a period. The following data are also available: Variable Fixed Unit manufacturing costs of the period $11.00 $3.00 Unit operating expenses of the period 1.00 4.00 The effect on operating income if absorption costing is used rather than variable costing would be a a. $46,004 increase b. $46,004 decrease c. $19,716 increase Cd. $19,716 decrease A business operated at 100% of capacity during its first month and incurred the following costs: Production costs (20,400 units): Direct materials $183,300 226,700 Direct labor Variable factory overhead 263,500 Fixed factory overhead 94,500 $768,000 Operating expenses: Variable operating expenses Fixed operating expenses 49,500 178,800 If 1,500 units remain unsold at the end of the month, the amount of inventory that would be reported on the variable costing balance sheet is a. $49,530 b. $56,471. Oc. $69,618 Od. $599,029 $129,300