皆さん、 Hi, and thanks in advance for good advice! I would like to be able to say X percent of something, but I haven't been able to find the particle that would correspond to of. Could you use の？ For example, in a sentence 人口の10パーセント (10 percent of population)?
Yes, I think you can say の here:
I think it would be more common to write ％ than パーセント, but either way.
As an aside, for even tenths I think you can use 割 instead:
Each 割 is one tenth.