Sandhill Company sells its product for $10200 per unit. Variable costs per unit are: manufacturing, $5200; and selling and administrative, $135. Fixed costs are: $28800 manufacturing overhead, and $38800 selling and administrative. There was no beginning inventory at 1/1/20. Production was 24 units per year in 20202022. Sales were 24 units in 2020, 20 units in 2021, and 28 units in 2022. Income under variable costing for 2021 is $64200. $34500. $29700. $37200.