I'm using QGIS and trying to solve the following problem.

I got 2 layers:
1. population density raster
2. point layer with the information about number of people could be hosted/served etc in this points. enter image description here

I want to show the area where such number of people (that could be hosted/served) lives around this points (for instance, using circle diagrams).

I thought about creating multibuffer, then counting the number of people living in each of them and manually trying to find the most appropriate size of it.
However, I believe there is more rational option.

Could you please propose any solutions?

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