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.
[[20, -58, -23, -148, -80, 24], [-180, 27], [79, -107, -15], [-142, -81, -20, -81]]