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.
[[-10, -22, -28], [-27, 35], [-48, -3, -30, -14], [7, 39, -23, 30, 21]]