A target is made of a yellow square inside of a green square. What is the theoretical probability that a dart will hit the green square if the side length of the yellow square is 4, and the side length of the green square is 8? Use percent or decimal.
The area of the yellow square is $4^2=16$ square units, and the area of the green square is $8^2=64$ square units. Thus, the ratio of the area of the green square to the total area is $\frac{64}{64+16}=\frac{64}{80}=0.8$. This probability can also be expressed as 80%.
