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.
[[-22, 50, -11, -47], [-15, -14], [28, 45], [42, 43, 50, -39, -18]]