from typing import List


def get_percentage_of_points_changed(previous_labels: List, labels: List) -> float:
    """Get the percentage of points that changed clusters.

    Args:
        previous_labels: The labels of the points before the update.
        labels: The labels of the points after the update.

    Returns:
        The percentage of points that changed clusters.
    """
    num_points = len(labels)
    num_changed = 0
    for i in range(num_points):
        if previous_labels[i] != labels[i]:
            num_changed += 1
    return num_changed / num_points * 100.0