The ratio between the cost of the markers to the number of markers you're buying, 11.50 to 9, is equal to the ratio of the cost of 7 markers to the number of markers, which is obviously 7. So

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A percent is actually a ratio! Saying 25% is actually saying 25 per 100: 25% = 25 100. We can use proportions to solve questions involving percents. The trick is to put what we know into

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