San Ruiz Interiors provides design services to residential and commercial clients. The residential services produce a contribution margin of $460,000 and have traceable fixed operating costs of $490,000. Management is studying whether to drop the residential operation. If closed, the fixed operating costs will fall by $420,000 and San Ruiz' Income will: Multiple Choice Increase by $30,000 Increase by $40,000. increase by $390,000 decrease by $40,000