How much does it cost to go to Japan for about ten days?

I go to Japan with 2-3 people. In Japan, the room rate is calculated according to the number of people. Living with 2-3 people is more cost-effective than living with one person on average. But because of work, I have been going during the winter and summer vacations, so the air tickets are not cheap. Japan has been to Japan four times, and basically the budget for more than ten days is around 15000 RMB. The consumption in Hokkaido will be more expensive, which may be 1.006 to 1.007. This budget includes all expenses, even including the cost of eating a snack in an ice cream drink shop on the roadside, but it does not include shopping, because shopping is bottomless. I am not a poor traveler. I don't usually go to hotels where many people live together, and I don't choose capsule hotels because my family can't get used to it. But every time, we always ensure that the budget is within these ranges. Stay in a cheap hotel for a few days, and a good hotel for a few days. Cheap is generally around 200-300 a night, and lucky may include breakfast or coffee. In fact, the accommodation in Japan is very clean, but their rooms are relatively small. Cheap rooms may not be able to leave without opening the box. It doesn't matter if you just sleep anyway. Good hotel I stayed in another hotel this time and the food was very good. There is also a sea view room and a hot spring facing the sea view, which is really super comfortable.