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.
[[84, 92, -20, 91], [47, -136, -93], [9, -132], [-121, 60], [-48, -72, -64, -64, -71, -15], [-38, -13, -81]]