McShane Inc. manufactures hair brushes that sell at wholesale for $60.00 per unit. Budgeted production in both 2009 and 2010 was 2,000 units and fixed overhead budgeted was $25,000 in each year. There was no beginning inventory in 2009. The following data summarized the 2009 and 2010 operations: 2009 2010 Units sold 2000 2000 units produces 2500 1500 Costs Variable Mfg unti cost 20 20 Fixed factory overhead 25000 25000 Variable marketing unit cost 2 2 Fixed administrative 10000 10000 Required: Determine income under both full costing and variable costing and explain the difference