Taxi from Xianxiang station to Yuntaishan

Hi,
If we miss 7.30 bus or it is full, what is the taxi cost to Yuntai? Do I need to ask for the price or just tell the driver to use meter?
What is the cost of the bus ticket? We have 4 people so I think it may be easy to take a taxi if the cost is not much different.
Thank you.