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: [[11, -34, -15, 2], [42, 20, -20, -18], [8, 32, 12], [-20, -9, 38, 47]]

[11220, 302400, 3072, 321480]