20 books are 20$ 30 books are 75$ and 40 books are 100$ WHAT IS THE ANSWER

Answer this question! 30 points and brainliest! only if you know the answer.

Brent wants to know what is 5 x 1/2

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer