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: [[22, 8, 1, 21, -29], [-35, 11], [13, 44], [45, 50, 31]]

[-107184, -385, 572, 69750]