Travel to Eurpoe is much more expensive than travel to China.
First of all the Ticket to Eurpoe is almost the same as the ticket to China, I brought my ticket from air Canada to London, cost $1300.
The food and hotels are very expensive in Europe. Usually I had to pay $200 /day, you can find hostel that's around $60 /day.Food are relatively expensive because of the exchange rate.
All in all, it costed me $15,000 for 3 people travel in Eurpoe for 25 days.
you can do the math of how much it costs to travel to China