How much is a taxi from PEK airport teminal 2 to TianAn Rega Hotel (dongcheng district)?

It costs CNY90-100 and takes about 40 minutes.
Or you can take airport express and transfer to metro line 2 at Dongzhimen. Then, change to line 1 at Jianguomen, and get off at Wangfujing. Leave from Exit C1 and walk west for 5 minutes. Turn north and walk for another 5 minutes, you will see you hotel. It takes about 1h and CNY31.