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.
[[4, 15, 21, 1, 43], [37, -32, -48, 16, 10], [21, 49, -9], [-34, 47, -41, 39]]