What we can notice about the percent of saving from the examples is that the actual percentage discount is less than what most people think they are getting as savings.
When people see a double sale, they tend to add up both percentage discounts and think that this is what they are saving.
For instance, in the first example people would add up the 15% in the first sale to the 20% in the second and believe they are making savings of 35%.
They aren't in fact making a savings of 35% but of 32% because the second discount of 20% would only apply after the first discount of 15% has been applied.
Find out more on discounts at https://brainly.com/question/1548141.