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What time does the bus from Danzhou, Hainan Province to Xinyi, Guangdong Province leave?

Today, after the National Day, it takes 3 15 yuan to buy a ticket for Xinyi's return to Hainan University on the 9th. I came to 250 yuan on the 30th, and now I'm calling Hainan, and Xinyi on the 9th is also in 250 yuan. I don't understand why I need 3 15 yuan to go back to Hainan University that day. Isn't it bad that Xinyi South Station doesn't buy tickets at a high price?