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.
[[-48, -43, -20, 15], [-50, -28, 46], [42, -40, 16], [43, 0, 38, 0], [-38, -45], [49, -13, -2, -12], [46, 0, -20, 31]]