Triangle ABCis transformed with the center of dilation at the origin.

Pre-image: △ABC with vertices A(−3, 4), B(−1, 12), C(4, −2)

Image: △A′B′C′with vertices A′(−0.6, 0.8), B′(−0.2, 2.4), C′(0.8, −0.4)

What is the scale factor of the dilation that maps the pre-image to the image?
Enter your answer in the box.