During January, DIB Inc. produced 10,000 units of product with costs as follows: Direct materials $40,000 Direct labour 22,000 Variable 10,000 overhead Fixed overhead 90.000 $162,000 There was no opening inventory, and during the month of January, DIB sold 8,000 units. What is the value of closing inventory under variable costing? O $12,400 O $14,400 O $162,000 O $32,400