answer: #Person1# buys a dozen roses from #Person2# as his wife's birthday gift, and it costs him only $20.
documents: #Person1#: It's my wife's birthday. I need to buy some flowers for her. 
  #Person2#: Most women love red roses for their birthday. 
  #Person1#: How much will the roses be? 
  #Person2#: You can get a dozen for only $20. 
  #Person1#: Now, that's a price that I like. 
  #Person2#: You're in luck today because the roses are on sale. 
  #Person1#: Okay, I'll take the roses. 
  #Person2#: Very good. Perhaps you'd like something else to go with the roses? 
  #Person1#: No, the roses are good enough. 
  #Person2#: Women love roses, so your wife will be very happy.