Explain to me this

[Meriem-Mimi]

Hi guys! Well,I've been revising for my english exam,and i got stuck on something,
When we say "All of" we mean 100%
"Half of" is 50%
None of is 0%
How about: 80% , 40% , 60% , 10% and 12% ?
Thank you

[Karim-Rap-4-Life]

An indefinite pronoun does not refer to any specific person, thing or amount. It is vague and "not definite". Some typical indefinite pronouns are
well you can learn more on this website I can't copy the whole course here because I already did and it was a mess so try to learn something follow this link and I hope it won't be deleted by the administration

http://www.englishclub.com/grammar/pronouns-indefinite.htm

[haaaaajer]

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[هامجا جيوفاني]

You can say: eighty percent of..., forty percent of...
good luck

[نارينا]

"most of" is used to talk about the other percentages