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: [[21, 6, -32, -31], [-25, 31], [-47, -37, -24], [-7, -22, 10, 18, -21]]

[124992, -775, -41736, -582120]