columbia corporation produces a single product the companys variable costing income statement for november appears below columbia corporation income statement for the month ended november 30 sales 15 per unit 60 variable expenses variable cost of goods sold 360 variable selling expense 80 total variable expenses 440 contribution margin 160 fixed expenses manufacturing 1050 selling and administrative 350 total fixed expenses 140 net operating income 20 during november 350 units were manufactured and 80 units were in beginning inventory variable production costs per unit total fixed manufacturing expenses and the number of units produced were the same in prior months the value of the companys inventory on november 30 under absorption costing would be