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.
[[23, 17, 40, 17], [47, -32, 31, 35, 49], [20, 20], [-48, 45, 20, 46]]