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.
[[12, -48, -30, 0, -7], [4, 50, 49, 21], [-4, -19, 28, 35, -39], [12, 10], [34, 5], [14, 0, 42], [-29, -9, 32], [38, 5], [-42, 39]]