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: [[47, 1, -31], [-37, 5], [-15, -7, -45, 13, -44], [3, 45, -12]]

[-1457, -185, 2702700, -1620]