Minya Hotel Shanghai to Pudong airport

My family of 5 need to leave Minya Hotel Shanghai on Sept. 29 to Pudong Airport to catch a 2 pm flight to Hong Kong. What would you suggest, taking shuttle bus or a taxi from the hotel. Shuttle bus fare is CNY20/person? what is CNY = china money or canadian money. How much will need to get a taxi for that and can they fit 5 riders other than taxi driver. Any addition charge of luggle when taking a tax.