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.
[[-1, -13], [-189, -154, -172, -140, -84], [20, -52, -31, 35, -30, -2, -155]]