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4. display a list of all book titles and the percentage of markup for each book. the percentage of markup should be displayed as a whole number (that is, multiplied by 100) with no decimal position, followed by a percent sign (for example, .2793 = 28%). (the percentage of markup percentage of markup should reflect the difference between the retail and cost amounts as a percent of the cost.)

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4. display a list of all book titles and the percentage of markup for each book. the percentage of m...
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