None.
110 mg is a measure of mass. A percentage is a pure number - without any [dimensional] units. Any attempt to convert from one to the other is a not valid.
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That depends what the measurement is one percent of.
That depends on how many there are in the whole group. "6.3 percent" means "6.3 out of every hundred". If there are 100 in the whole group, then 6.3 percent is 6.3 students.
102
how many sixteenths are there in 75%
Neither. A person should always ask: "what is the percentage?" or "how great is the percentage?"