how to answer this question

Question

Helena can buy 2 shirts for $25 or 3 shirts for $36. Do these quantities have a proportional relationship? Explain

Answer 1

2 for 25 means 25/2 = $12.50 per shirt

3 for 36 means 36/3 = $12.00 per shirt

slight "volume" discount if you buy 3 instead of 2

2/25 does not = 3/36 though

25/2 > 36/3, which is the proportion relationship