I need some help help help help help help help help help help help help help help help help help help help help help help help help help help help helphelp help helpp help plz question below

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

52 cm radius = diameter = area = circumference = circumfer

Answer! if you don’t mind, can you explain