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: [[42, 31, 9], [-41, -5, 48], [-17, 16, 30, -15, -38], [-3, 15, 31, 30, -15], [20, 1, 13, 7]]

[11718, 9840, -4651200, 627750, 1820]