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I think it''s potentially misleading to try to relate zones to specific percentages because zone grays are not standardized. They're generally considered to represent the print gray tones that result from from subject luminances that are measureably one stop apart' that is, zones and stops are said to be equal (when the subject range is normal).
But that "one zone, one stop" relationship doesn't apply directly to either the negative or the print because on the non-linearity of photo reproduction.
The concept of zones is useful in visualization, but it's less reliable when applied to actual negative or print densities.
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