Question 12(Multiple Choice Worth 2 points)
(Constant of Proportionality MC)

The table shows the proportional relationship between the price for a certain number of buckets of golf balls at a driving range.


Buckets 3 5 7
Price (dollars) 28.50 47.50 66.50


Determine the constant of proportionality.
9.5
10.5
18.25
28.5