Definition: 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.
Input: [[48, -1, -15], [-9, 18, -45, -39], [-2, 13, 42, 11]]

[720, -284310, -12012]