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.
[[26, 12, 8, -21, -15], [-50, 42], [42, 22, 4, 26, 43], [2, -48, -18, -15, 9]]