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class Solution {
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  public int percentageLetter(String str, char letter) {
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    int count = 0;
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    int n = str.length();
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    for (int i = 0; i < n; i++) {
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      if (str.charAt(i) == letter) {
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        count++;
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      }
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    }
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    int per = (100 * count) / n;
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    return per;
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  }
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}