Which bus do I have to take to get to 115 pen lai lu in Shanghai?

I think you may mean from the Pudong airport to Penglai Road, right?
If so, you can take the local subway line 2 to reach East Nanjing Road where you can change to line 10 to reach Laoximen Station.
Get out of the station from Exit 7 and then you can walk along Renmin Road, Zhonghua Road to reach Penglai Road.

Yes I meant Penglai road. And thank you so much for your information. We can also take the Maglev train right? Do you know how much that costs?

Yes, you can surely take Maglev as well. Take it to Longyang Road, where transfer to local subway line 2 to East Nanjing Road Station. Then transfer to line 10 to Laoximen.

Maglev train costs CNY50 per person and the MTR fare shall be CNY4/person.