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: [[19, 31], [7, 12, -36], [-9, 7, 47, -21], [-5, -15, 42, 36, 40]]

[589, -3024, 62181, 4536000]