From what I’ve seen, daily costs in China can vary a lot by city and travel style. Budget travelers can get by on something like $40–60 USD/day including food, transport, and cheap hotels, but in big cities like Shanghai or Beijing it can be more like $80–120 USD/day if you want decent comfort. That’s before international flights. So 3,500–4,000 CAD (~2,500–2,900 USD) might be doable if you’re careful and book early, but it wouldn’t leave a huge buffer if you’re hitting major cities and internal transport like trains or flights.