Beaver Company (a multi-product firm) produces 5,000 units of Product X each year. Each unit of Product X sells for $8 and has a contribution margin of $5. If Product X is discontinued, $18,000 of fixed overhead would be eliminated. As a result of discontinuing Product X, the company's overall operating income would: a.decrease by $25,000 b. increase by $43,000 c. decrease by $7,000 d. increase by $7,000