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.
[[-7, -3, -28], [18, -132], [-63, -120, -57, 82, -189], [-155, 81], [-134, 97, 49, -162, -144, -110], [-21, 28]]