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The graph indicates the fluctuation of sales volume at Student Travel in 2007. Overall, the trend presents three obvious peaks which are appeared near the March, June and October. As you can see, a peak reached at 35,000 dollars, which was followed by a gradually growth. Another peak was appeared with 50,000 dollars, and then went into a trough. Finally,it jumped significantly and arrived the last peak which had the largest number of ticket sales with approximately 72,000 dollars. There were some possible reasons resulted in the undulation .The first peak could have resulted by the eastern holiday, owing to some students had a short break to relax. And because the winter holiday had more time for children to enjoy themselves, the larger amount of ticked had been sold. The summer holiday not only can provide longer time than winter holiday, but the weather was more suitable for people to travel, it maybe was the main reason for the highest zenith. In conclusion, the holiday should be the major cause of the trend, and it’s easy to predict that the oscillation will be repeat in every year.