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.
[[-40, -2, 32, 47], [-5, 5, -27, 27], [31, -40, 31], [-42, -19]]