Answer: the break-even point for this bookstore is 10 books.
Step-by-step explanation:
Let x represent the number of books that the bookshop buys and sells.
The bookstore costs $80 a day to keep open, and it spends $15 for each each book that it sells. It means that the total amount that the bookshop spends on x books is
80 + 15x
If each book sells for $23, it means that the revenue that the bookshop generates from selling x books is $23x.
At the point of break even, total cost equals revenue. Therefore,
23x = 80 + 15x
23x - 15x = 80
8x = 80
x = 80/8
x = 10
