In this task you will be given a list of lists, of numbers. For every inner list, you should multiply every number in that list and put the results in your answer. The output should be a list of numbers with the same length as the number of the lists in the input list.
[[12, 31, -21, 30, 40], [-38, -4, 27], [9, 23], [-37, -9, 31, 40], [-36, -50]]