Correct answer: 0.993 to 0.994 OR 99.300 to 99.400
Explanation
All series components must work, so Rsystem=r³=0.98. Taking a cube root gives r=0.98^(1/3)=0.993288, or0.993. The final key also accepts its percentage form99.300–99.400; both disjoint grading ranges are preserved.
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