import math


def split_list_by_percentage(
    list_to_split: list, percentage_to_split: float
) -> "tuple[list, list]":
    """
    Split a list into two sub lists
    the second sub list has the length 'len(list) * percentage_to_split'
    """
    split_index = math.floor(len(list_to_split) * percentage_to_split)
    return list_to_split[split_index:], list_to_split[:split_index]