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.
[[-150, 52, 90, -71, 59, -189], [-149, 29, 47], [-4, -42, 16, 43, -9, -50, -48]]