Answer:
cylinder
Explanation:
You want to know which of two popcorn containers is a better value:
- cone: diameter 12 cm, height 19 cm, cost $6.75
- cylinder: diameter 8 cm, height 15 cm, cost $6.25
Volume
The volume formulas for the two shapes are ...
V = 1/3πr²h . . . . . cone
V = r²h . . . . . . . . . cylinder
Ratio
For r = d/2, the ratio of these two volumes is ...

The cone has less volume and costs more, so the cylindrical container is the better value.