ebba is buying bulk fabric. she is shopping for the best deal. drag the fabric in order from the least to the greatest unit cost in dollars per square yard.

To find the cost per yard, divide the cost by the amount:

p: 6.25 / 6.5 = 0.96  -->  The cost per yard is $0.96
r: 3 /4 = 0.75  -->  The cost per yard is $0.75
b: 8.1 /8.5 = 0.95  -->  The cost per yard is $0.95
s: 7.2 / 6 = 1.2  --> The cost per yard is $1.20

In order from cheapest to most expensive:
Red
Brown
Purple
Silver

Hope this helps.

72 is the mode because it shows up the most number of times