Sentence 1: A man walked into a barber shop and wanted to buy all the cut hair. 
 Sentence 3: The barber told him it would cost $50 for it all 
 Sentence 4:  The man paid him the money and demanded the barber's own hair too 
 Sentence 5:  The barber thought it was far and shaved head head on the spot 
 Option 1: The barber never had anyone ask for it so he didn't know what it cost. 
 Option 2: The barber said he could ahve it for free.