Why do 30 per of the PHS to sell prepaid card 31? ? ! !

Users questions: PHS used for so long, I have been out there do not understand why the 30 yuan since the market's top-up cards bought after the sell 31! I have asked the store owner, who said that he earn dollars! Then I do not understand, why 50 yuan and 100 yuan will be able to sell the original price, 30 dollars for non- To increase 1 yuan? Is this the requirements of telecom companies selling price? However, clearly written on the card is 30 yuan ah ~! Please help me solve this mission fog Ha! I am different areas in Chongqing
Experts answer:, price different to Beijing, for example, small vendors are basically the original price to sell, such as the 50 is 50,100 is a 00. The wholesale card market, a little cheaper, such as the sale of 100 99 * 98 * 97, etc. In short, multi-buy offers larger. Some cities such as Tianjin, are based on the increase in the card price 1-2 dollars, can be gas is a CNC shop business card next to the street vendors not to sell confidently sell the card plus the money. The question is Vending's too little, as Beijing is filled with cards sold
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