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: [[-9, -7, 42, 42, 20], [-12, -37, -13], [-10, -50, -20, -39], [-2, 9, 5]]

[2222640, -5772, 390000, -90]