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E4-13 STRAIGHTFORWARD CONTRIBUTION INCOME STATEMENT Yoko Trucks Ltd. had the following data (in millions of yen) for a given period: Sales 1770 Direct materials 290 Direct labour 140 Variable factory overhead 60 Variable selling and administrative expenses Fixed factory overhead Fixed selling and administrative expenses 45 100 120 There were no beginning or ending inventories. Compute (1) variable manufacturing cost of goods sold, (2) contribution margin, and (3) operating income