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.
[[-20, -39, 15, 38], [20, 38, 11, -38], [-29, -15, 7, -30], [-11, 48, 35, -47]]