A manufacturer sells $8/unit to wholesalers who mark up by 25% on retailer purchase price. Afterwards, the retailers mark up by 33.33% on wholesaler selling price. Here, All the other 4 answers are correct both wholesaler and retailer markup are based on selling price wholesaler markup is based on cost, retailer markup on selling price wholesale markup is based on selling price, retailer markup on cost both wholesale and retailer markup are based on cost