4. The following information is available on Tackler Co's two product lines: Chairs Tables Sales $180,000 $48,000 Variable costs (96,000) (30,000) Contribution margin 84,000 18,000 Fixed costs: Avoidable (36,000) (12,000) Unavoidable (18,000) (10,800) Operating income (loss) $30,000 $(4,800) Assuming Tackler discontinues the tables line and does not replace it, what will hap to the company's operating income