Astore owner buys backpacks at a certain price and sells them at a higher price. the difference is called the markup. if she pays $21 for a backpack and adds a 40 percent markup on the price she paid, what is the selling price?

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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35-60 students are taking math.

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