I'll give you a question, please answer with step-by-step reasoning process.
In a bookstore, a book costs $5. When Sheryll bought 10 books, she was given a discount of $0.5 each. How much did Sheryll pay in all?

45
Instead of $5 each, a book costs $5 - $0.

5 = $4.

5 each.

Sheryll paid $4.

5 / book x 10 books = $45.

.

So, the answer is 45