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: [[-28, 42], [-5, -44], [16, -1, -48], [-39, 20, -5]]

[-1176, 220, 768, 3900]