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.
[[47, 12], [16, 41, -40], [-4, -47, 30, 23], [36, 0], [9, 31, 39, -31]]