Taxi cost between Luoyang Longmen station to Peony Park.

We are a group of 4 persons traveling from Xian to Luoyang in one day trip. We will take a taxi between 1.LY Longmen station to Peony Park, 2.Peony Park to Longmen Grottoes and Longmen Grottoes to LY Longmen station. How much does the taxi cost?

Thank you very much.