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, 19], [46, -38, -5], [38, 33, 11, 5], [42, 23]]

[741, 8740, 68970, 966]