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.
[[-81, -85, -109, -139, -112, 75, -101], [-161, -104, -130, -188], [-137, -58], [29, 80, -12, 21, -144, 55, -13]]