There are 4 levels in the supply chain for this question. Acme Manufacturing sells their product to a wholesaler, who then in turn sells to a distributor, who then in turn sells to a retailer. Acme sells for $25 and yields $5 margin, the wholesaler sells for $28, and the distributor sells for $30. If the retailer wants to yield a $4 margin, what do they need to mark up the product (in %)?