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.
[[-3, 36, 48, 43, -13], [-12, 12, -47], [-29, 44, -12, 31], [-46, -25, 31], [17, 12, -21]]