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, -8], [23, -43, 49, 7, 21], [27, 20, -18, 26, -15], [-22, 28]]