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.
[[-15, -50, 9, 31], [-26, -50], [6, 45, 8, 37, -34], [46, -48], [-13, 27, 21]]