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, 34, 34, 18, 15], [0, 48, -46, 43, 3], [-38, 37, -17, -34], [15, 18, -42, 20]]