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, -10], [5, -20, -46], [9, -40, 24, 24, -31], [48, 5], [2, -41], [-15, 4, 12, -21]]