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.
[[24, -34, 7, -15], [-14, -48, -35], [25, 50, 17, 23], [29, 25, 15, -18]]