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: [[20, -31], [-35, -41, -18, -24], [-11, 29, -16, -11, -15], [43, 39, 10]]

[-620, 619920, 842160, 16770]