NewVita sells its products to independent wholesalers who then sell to retailers. The wholesalers earn 60% margins and the retailers average 25% margins. Current retail selling price for each pack of vitamins is $20. What is the cost to the RETAILER? (Enter your answer in whole dollars. For example enter $20 as 20) Hint: Remember, the gross margin for wholesalers and retailers are based on their respective selling price and not the final retail price