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A common misconception with percentage applications is that students will confuse the percent with the part. This shows a lack of understanding of the proportionality in percentage problems. Using strip models can help. This resources attempts to tap into students' sense of right and wrong by comparing two waitresses who both earn 15% tip but the food bill at one restaurant is always much more than at the other. Is it fair that both do the same amount of work but earn different tip amounts?
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