Definition: 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.
Input: [[31, 13, -16], [25, 45, -46, 18], [-40, -21, -12], [-13, -43, -18], [-4, -35, -23, 27, 28], [10, 20, 34, -42]]

[-6448, -931500, -10080, -10062, -2434320, -285600]