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.
[[20, 36, -3, 20, -40], [-36, 45, 3, -13, -49], [-15, 21, 17, -31, -5]]