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, 49, -14, -9, -21], [3, -5], [-7, -20, -28, 16], [47, -48, -2]]

[-2593080, -15, -62720, 4512]