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: [[13, -5], [44, -26, 35], [9, 27, -49], [-41, 48], [-42, -13, -23, 44, 31]]

[-65, -40040, -11907, -1968, -17129112]