I will go to Huangshan city on sep 09-13 with 15 people. so could you tell me where is the cheaper hotel

I think 7-Days Inn in Tangkou is suggested for you and this hotel is just about 1km from the south gate of the attraction.
Taking a taxi from the airport to Tangkou costs about 150 to 160RMB.
To reach the cable car station from the hotel, it is suggested to walk to reach easily.