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, 21, 44, 20, 45], [-17, -28, -3], [28, -16, -9], [-50, 20, 3, 5, 3]]