What is the total cost for entrance to the summer palace and where to buy the ticket?

Actually I was there yesterday. My friend took me. Entrance to the grounds are 30 RMB PP. Half tickets are 15RMB (i guess half tickets are for children or retired). The through ticket is 60 RMB PP which will allow you entrance to various other buildings. There is a further charge of 15 RMB for the boat ride as it gives you access to other parts of the ground. We bought the tickets at the site. There were long qs but it did not take long. Parking is a problem. Better carry plenty of water and food as it is expensive on the site.