Are these rates proportional?

2 ounces for $0.75

4 ounces for $1.50

8 ounces for $2.50

My answer is No

is this right

no is correct

Step-by-step explanation:

it is proportional until 8 ounces.

the first one is $0.75 you add another $0.75 and that equals $1.50 then you would add $1.50 and $1.50 then it equals $3.00 and it should be $2.50 so therefore it is not proportional