Amy printed a square picture that was \( 225 \% \) the size of the original picture. The length of the side of her original picture was 4 inches. What is the length of the side of Amy's printed picture?

To find the length of the side of Amy's printed picture, we first need to calculate \( 225\% \) of the original picture's side length. The original length is \( 4 \) inches. To calculate \( 225\% \) of that, we convert the percentage to a decimal by dividing by \( 100 \): \[ 225\% = 2.25 \] Now, we multiply \( 2.25 \) by the original length: \[ \text{Length of printed picture} = 2.25 \times 4 \text{ inches} = 9 \text{ inches} \] Thus, the length of the side of Amy's printed picture is \( 9 \) inches.