answer: #Person1# bid on a shirt and a racket. #Person2# thinks #Person1# doesn't familiar with bid.
documents: #Person1#: I decided to give it a go!
  #Person2#: Good for you. What items did you bid on?
  #Person1#: A DENY shirt and one of Serena Williams'used tennis rackets!
  #Person2#: Your idol! Wow! You're even better at finding stuff than me!
  #Person1#: Yep. I placed a bid for the shirt. The minimum was ten so I bet fifty!
  #Person2#: That's not how this game works.
  #Person1#: Well, there was a sign that said ' Buy now for seventy. '
  #Person2#: How many bids had been placed before you?