The school's enrollment before the increase IS $460.
Percentage can be described as a fraction out of an amount that is usually expressed as a number out of hundred. The sign used to represent percentages is %.
In order to determine the required value, divide the cost of the school enrolment after the increase by 110%(100 + 10).
$506 / 1.10 = $460
To learn more about percentages, please check: https://brainly.com/question/25764815