In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-42, -123], [31, 13, -187, -19, -8, -54], [-189, 52, -50, -86, 21, -80]]