After selling 35 books, the store will break-even.
Step-by-step explanation:
Given,
Cost required per day to keep store open = $105
Amount spent on each book = $12
Let,
n be the number of books.
Total costs = 12n + 105
Selling price of each book = $15
Total revenue = 15n
For braking even;
Costs = Revenue
[tex]12n+105=15n\\105=15n-12n\\105=3n\\3n=105[/tex]
Dividing both sides by 3
[tex]\frac{3n}{3}=\frac{105}{3}\\n=35[/tex]
After selling 35 books, the store will break-even.
Keywords: revenue, cost, division
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