Fishing Pole Shopping

One day a lady went into a fishing shop to buy her husband a fishing pole for his birthday. She picked up a really nice looking pole and asked the salesman how much it was.
The salesman said, “I am blind but if you give me the pole I can tell how much it is by the weight.”
So the lady gave him the pole and he said, “That pole is worth $45.” She was amazed at how cheap that was so she picked up another really nice pole, handed it to the man and he said, “This pole is worth $55.” She decided that was still less than she wanted to spend so she picked up the nicest looking pole in the place and handed it to the man. “This pole is our best and it is $70.” The woman was happy with his response and said she was taking it.
As she was getting the fishing pole rung up, she had to fart really really badly. She thought about it and decided, since the man was blind, there was no way he would know if it was her, or another customer, so she let it all out.
All of a sudden the man says, “It all comes up to $80.”
Confused the lady says to him, “But you said the fishing pole was only $70.”
He said, “It is. Its $70 for the fishing pole and $10 for the duck call.”