To find out how much the bookstore will sell each book for, we first need to determine the cost per book and then apply the 25 percent markup.
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Calculate the cost per book: The total cost for the case of 10 books is $84. To find the cost per book, we divide the total cost by the number of books:
\[ \text{Cost per book} = \frac{\text{Total cost}}{\text{Number of books}} = \frac{84}{10} = 8.40 \]
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Calculate the selling price with the markup: The bookstore plans to sell each book at a 25 percent markup on the cost price. We can calculate the selling price as follows:
\[ \text{Markup} = 25% , \text{of} , 8.40 = 0.25 \times 8.40 = 2.10 \]
Now, add the markup to the cost price to get the selling price:
\[ \text{Selling price} = \text{Cost per book} + \text{Markup} = 8.40 + 2.10 = 10.50 \]
Therefore, the bookstore will sell each book in the case for $10.50.