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A tile manufacturer has supplied the following data: Boxes of tiles produced and sold 580000 Sales revenue $2,842,000 Variable manufacturing expenses $1.653,000 Fixed manufacturing expenses $784,000 Variable selling and administrative expenses $145,000 Fixed selling and administrative expenses $128,000 Net operating income $132,000 What is the company?s unit contribution margin? $0.23 per unit $4.90 per unit $3.10 per unit $1.80 per unit