Jinan(4 days) and then to Hong kong(4 days) for 4 people

A 4-day trip in Jinan should cost CNY1500-2000 for 4 people including sightseeing, food, shopping and transportation.
The flight ticket to HK from Jinan values about CNY1,500 per person. HKD4,000-4,500 should be enough to cover the expenses for 4 people in Hong Kong except the accommodation.

Nilesh, the expenses Walton gave you when visiting the two cities should be referential. But the flight price varies a lot in different period. It is quite hard to say a specific range for you. But you are advised to book the tickets several days ahead of your schedule in order to get a discount.