As the manager of Speedy Supermarket, answer the following questions. (Round dollars to the nearest cent and percents to the nearest tenth of a percent.) Speedy Supermarket 4/85 2 Liter Bubbly-Cola Products 12 Pack Bubbly Cola Product SALE $13/3 (a) If 2 liter Bubbly-Cola products cost Speedy $15.30 per case of 24 bottles, what is the amount of the markup (in $) and what is the percent markup on selling price per case? amount of the markup percent markup on selling price % (b) If 12 pack Bubbly-Cola products have a markup of $8.55 per case of six 12 packs at Speedy, what are the cost (in $) and the percent markup on selling price per case? cost percent markup on selling price $ % (c) Why has Speedy Supermarket chosen to use markup based on selling price? The markup based on selling price is greater than markup on cost. The markup based on selling price is easier to calculate than markup on cost. Speedy Supermarket is a retail store and therefore uses markup based on selling price. Speedy Supermarket can control how much they pay for items using markup based on selling price. Speedy Supermarket is a manufacturer and therefore uses markup based on selling price.