conversations.from: human
conversations.value: 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?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: Instead of $5 each, a book costs $5 - $0.5 = $4.5 each.
  Sheryll paid $4.5/book x 10 books = $45.