If a store buys an item for $3 but then sells it for $5.70, what is the percent of mark-up?

Drivers must always yield to emergency vehicles traveling

Luke finds a great deal for pudding cups on amazon. he can get a 36 pack for $9.74. what a deal! each cup holds 3.25oz of yummy pudding, btw. luke also knows that the hot tub is about 5 feet width, 5 feet long, and 2.5 feet deep. how many packs will luke need to buy in order to fill the hot tub? how much will this prank cost him? need

How do you do this? i’ve marked the correct answer but i can’t seem to calculate