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.
[[0, 21, 8], [38, 24, 33, 45], [17, 36, 15, -18, 31], [-47, 7, 26, -50, 19]]