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: [[8, -21], [-35, -28, -4, -17], [30, 18, 45, -2], [15, 29, -10, 34, 20], [-40, -12]]

[-168, 66640, -48600, -2958000, 480]