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: [[39, -32], [-33, -33, 3], [48, 4, -16, -4], [13, -31]]

[-1248, 3267, 12288, -403]