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.
[[48, 8, 4, 13], [26, 24, 9, 17], [-14, -27, -36], [-31, -28, 13, 12]]