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.
[[11, -50, 10], [-28, -24, -12], [42, -44, -20, -17, -31], [-23, 35, 18, 38]]