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.
[[13, -46, 13], [-19, 25, 0, -21, 41], [-2, 0, -50], [-31, 4, -19, -39, 0]]