Final answer:
Typically, vowels make up about 40% of English text, so the remaining letters, which are not vowels, would be around 60%. However, the closest option given in the question is 80%, which is not a typical distribution but may be chosen if the text has a lower than usual vowel frequency.
Step-by-step explanation:
The question asks about calculating the percentage of letters that are not vowels in a mystery novel with 200,000 letters. In the English language, the vowels are A, E, I, O, and U. Generally, the distribution of letters is not even, but typically vowels make up about 40% of the letters in English text. Thus, if vowels comprise approximately 40% of the text, the remaining 60% would be consonants or non-vowel characters. Therefore, the percentage of letters that are not vowels would be 100% - 40% (percentage of vowels) = 60%. However, none of the provided options (15%, 45%, 80%, 85%) match this calculation. It's possible that the correct answer would be closest to 80% if the text has an unusually low vowel frequency, but without additional information about the specific text, we can't accurately choose from the options provided.