Phoenix Corporation manufactures smartphones, generally selling from 200,000 to 300,000 units per year. The following cost data apply to the activity levels shown: Number of Units Total costs Fixed Variable Total costs Cost per Unit Fixed Variable Total cost per unit Required 200,000 250,000 300,000 $ 16,400,000 25,400,000 41,800,000 $ 82 127 $209 a. Complete the table by filling in the missing amounts for 250,000 and 300,000 units. b. Assume that Phoenix actually makes 280,000 units. What would be the total costs and the cost per unit at this level of activity? c. If Phoenix sells each unit for $234, what is Phoenix's magnitude of operating leverage at sales of 280,000 units?