Can you please explain where you get the numbers from, how to calculate, please show all your work so I can learn and understand it

Example 1: Harvey Company started operations on 1/1/2010. Following is the summary of production and sales volumes (in units) for the first 3 years of operations: Summarv of Production \& Sales Volumes in Units Case A: Year 2010: Production = Sales =25,000 Units Case A: Year Production = 25,000=2 Selling price = Panel A: Absorntion Costing Svstem Panel B: Variable Costing System Reconciliation of Variable Costing and Absorption Costing Net Operating Income Diff. in NI = ABSI#Units produced #Units soldl* FMOH per unit =25,000 units 25000 unitsl x$6=0 Case B: Year 2011: Production > Sales Case B: Year Production > 25,000> Selling price = Panel A: Absorption Costing System Panel B: Variable Costing System Reconciliation of Variable Costing and Absorption Costing Net Operating Income Diff. in NI=ABS #Units produced #Units sold* FMOH per unit Case C: Year 2012: Production