Evualate the following expressions if x = 4

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?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Solve this problem! extra ! 3025/5.5 = a/90.75