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.
[[28, 31, -44, 16], [-41, 19], [-46, 5, 36, 26, 16], [-1, -42, -40, 21]]