Final answer:
The designer should keep the height of the can the same in order to maintain the same amount of soup.
Step-by-step explanation:
In order to keep the same amount of soup, the designer should keep the height of the can the same
. When the base area is enlarged to three times the original size, the volume of the can also increases by three times. Since the volume of a cylinder is equal to the product of its base area and height, the designer should keep the height the same to maintain the same volume. Changing the height to three times the original can would result in a larger volume and the can would no longer hold the same amount of soup.