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.
[[-75, -41, -141, -94, 89], [42, -121, -143], [-16, -63, -128], [-99, 50, 86, 18, 51, -144, 9]]