Popcorn sales:

Fantastic Fliks Popcorn: 2 bags for 21.00
Perfect Picture Popcorn: y=9.95
Movie Mania Popcorn:
# Of popcorn amount paid (in dollars)
8 81.20
6 60.90
4 40.60
2 20.30

Movie Company
Constant of Proportionality
Fantastic Flicks

Perfect Picture

The Big Screen

Based on the given information, the constant of proportionality for Fantastic Fliks Popcorn is $10.50 since 21.00 divided by 2 equals 10.50.

For Perfect Picture Popcorn, the constant of proportionality is not given as only the price per bag is mentioned.

For Movie Mania Popcorn, the constant of proportionality can be calculated by dividing the amount paid by the number of popcorn bags. The constant of proportionality for Movie Mania Popcorn is $10.15 since 81.20 divided by 8 equals 10.15, 60.90 divided by 6 equals 10.15, 40.60 divided by 4 equals 10.15, and 20.30 divided by 2 equals 10.15.

For The Big Screen popcorn, the constant of proportionality is not provided in the given information.