Blind Clerk in the Bass Pro Shop

A woman goes into Bass Pro Shop to buy a rod and reel for her grandson's birthday.
She doesn't know which one to get so she just grabs one and goes over to the counter.
A Bass Pro Shop associate is standing there wearing dark shades.
She says, 'Excuse me, sir. Can you tell me anything about this rod and reel?'
He says, 'Ma'am, I'm completely blind; but if you'll drop it on the counter, I can tell you everything from the sound it makes.'
She doesn't believe him but drops it on the counter anyway.
He says, 'That's a six-foot Shakespeare graphite rod with a Zebco 404 reel and 10-LB. test line. It's a good all around combination and it's on sale this week for only $20.00.'
'It's amazing that you can tel l all that just by the sound of it dropping on the counter', she says. 'I'll take it!'
As she opens her purse, her credit card drops on the floor.
'Oh, that sounds like a Master Card,' he says.
She bends down to pick it up and accidentally lets out a fart.
At first she is really embarrassed, but then realizes there is no way the blind clerk could tell it was she who tooted. Being blind, he wouldn't know that she was the only person around.
The clerk rings up the sale and says, 'That'll be $34.50 please.'
The woman is totally confused by this and asks, 'didn’t you tell me the rod and reel were on sale for $20.00? How did you get $34.50?'
He replies, 'Yes, Ma'am. The rod and reel is $20.00, but the Duck Call is $11.00 and the Bear Repellent is $3.50.'