Question

A used bookstore bought $500 worth of books. They sold the books for $1,200, making $7.00 per book. There were __?__ books involved.

A) 50
B) 100
C) 150
D) 200
E) 250

Answer 1

The bookstore bought $500 worth of books and sold them for a total of $1,200, making a profit of $7 per book. By subtracting the initial cost from the selling price and dividing by the profit per book, we find that 100 books were involved.

Step-by-step explanation:

The correct answer is option B) 100 books.

To solve this, we need to establish the profit made on each book and then calculate the total number of books sold. The bookstore sold the books for $1,200 and they made $7.00 per book. We also know they bought the books for $500. The profit on all the books is the selling price minus the cost, which is $1,200 - $500 = $700 total profit. If this profit was made by selling each book for $7.00 more than the cost, then we divide the total profit by the profit per book: $700 / $7.00 = 100 books.

To find the number of books involved, we can use the formula: Number of books = Total money earned / Money earned per book

Given that the used bookstore sold the books for $1,200, and made $7.00 per book, we can calculate:

Number of books = $1,200 / $7.00 = 171 books