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: [[-21, 17], [40, 4], [-34, 15, 31, -28, 50], [6, 17, -17, 16, 42]]

[-357, 160, 22134000, -1165248]