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.
[[-31, 7, 29, -21, 1], [-43, 6, -27, 47], [48, -35, 24, -23], [17, -8]]