When I was a student, I need to commute by bus everyday. Therefore, I buy twelve ticket at one time. It's may cost less than just by one ticket. I need to pay one thousand and two hundred NT dollars. But, if you just by one ticket, you need to pay one hundred and thirty dollars. After few months, the ticket rise its price. Buying one ticket, I should pay one hundred and fifty dollars. If I buy twelve tickets at one time, paying one thousand and four hundred and fourty dollars. One day. I know my classmate, Helen, she need to go to country. So, I recommend she could buy my ticket. And then, I want to sell her one hundred and twenty dollars. She got mad. She said: When you buy this ticket, you just paid one hundred dollars. WHY you want me pay more twenty dollars? I said: I just care about you. If you go to counter to buy ticket, you need to pay 150 dollars. I just sell you 120 dollars. And, if you don't buy my ticket, I will use it. Helen said: But, this ticket shows : I am one hundred dollars. I said: You must know one thing: At this time, anyone go to counter buy twelve ticket at a time, it's still 120 dollars per ticket. I sell you 100 dollars, means I lost 20 dollars. You know? Finally, Helen go to counter buy 150 dollars ticket. What's the matter with her? ----------------------------------------------------------------------------------------------- This is not my story. I just through net to share with interpal members. Does anyone can solve this problem? --

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