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, -50, 30, 22, 38], [19, -33, -3, -21], [31, 7], [-28, -4, -8, -39]]

[48906000, -39501, 217, 34944]