Can I help you ?   Is This where I pay the airport tax ?   Yes , sir . Just as the sign says . How many ?   I'm sorry , but I've never done this before . How many what ?   How many people are you paying the tax for ?   My wife and me . The two of us .   100 yuan each , so you owe me 200 yuan .   Oh , OK . Here's 200 yuan .   Here are your two receipts . 