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, 41, 20, -43], [18, 16, -43], [-23, -7, -40, 14], [-34, 36, 37, -48, -19]]