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, -44, 28, 13], [45, 47, -23], [-24, 11, 17, -9, -18], [6, 0, 2], [43, 39, -24], [37, 12], [-13, -50], [15, -22]]