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: [[12, -49, -9, 9, -21], [43, 20, 42, -14, -39], [-48, -19, 28, -7, -47], [-8, -33, -30, 2]]

[-1000188, 19721520, 8401344, -15840]