Ring, Incorporated's income statement for the most recent month is given below. Total Store Store Sales $600,000 $200,000 $400.000 Variable expenses 384.000 144000 240.000 Contribution margin 216,000 56000 160 000 Traceable foxed expenses 152.000 42.000 110.000 Segment margin 64,000 $14.000 $50.000 Common fxed expenses 34.000 Net operating income $ 30.000 The marketing department believes that a promotional campaign Store P couting 5,000 will increase by $15.000. the campaign is adopted overall company net operating income should decreme by SRO b. decrease by $5,800 o increase by 55,800 d increase by $10,000