A green roof is like a traditional roof but covered with plants. Plants used for a green roof cost $0.75 per square foot. The roof shown is 40 feet long. How much does it cost to cover both sides of the roof?

An image shows the outline of a triangle at the end of a roof. A line showing the height of the triangle makes a right angle with the base of the triangle and divides the base into two segments. The height is labeled 8 feet. Each segment of the base is labeled 15 feet.