Q: Is percentage a number or ratio expressed as a fraction of 100? ¶
A: Yes.
Q: Is percentage relative to? ¶
A: Yes.
Q: Is percentage also used to express composition of a mixture by mass percent and mole percent? ¶
A: Yes.
Q: Are percentages often used to express a proportionate part of a total? ¶
A: Yes.
Q: Are percentages to be written? ¶
A: Yes.