Sheffield Corp. sells its product for $70 per unit. During 2019, it produced 60000 units and sold 50000 units (there was no beginning inventory). Costs per unit are: direct materials $15, direct labor $12, and variable overhead $1. Fixed costs are: $720000 manufacturing overhead, and $90000 selling and administrative expenses. Ending inventory under variable costing is $1400000. $700000. $400000. $280000.