Answer:
The probability is 42%
Explanation:
1. First take in account that the probability of take a vowel will be given by the following equation:

2. Count the number of vowels.
The number of vowels in the word "Mathematical" is 5
3. Count the total number of letters.
The total number of letters (including the vowels) in the word "Mathematical" is 12
4. So we have the following:


Therefore, there are a probability of 42% that the piece of paper will be a vowel.