Can someone help please and (if you can)explain how to get the answer pls

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?

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.

Three consecutive integers have a sum of 234. what are the three integers