any advice?

Johns Company operates in three different industries each of which is appropriately regarded as a reportable segment. Segment No. 1 contributed 60 percent of Johns Company's total sales. Sales for Segment No. 1 were $500,000 and total variable costs were $400,000. Total common costs for all segments were $320,000. Johns allocates common costs based on the ratio of each segment's sales to the total sales. What should be the contribution margin presented for Segment No. 1? $(100,000) $8,000 $20,000 $100,000