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% markup on the price she paid, what is the selling price?

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)