A non-repeating decimal is a decimal that never repeats itself. For example, pi is a non-repeating decimal.
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100% as a decimal is 1.
As given in the question, it is a terminating decimal.
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 86, exactly as in the question.
Terminating decimal
No by definition a decimal number can never be an integer because an integer is a whole number (it can not have any decimal parts).