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: [[20, -43, -3, 35], [7, -20], [-20, -41, 2, -38, -14], [-39, 3, 31]]

[90300, -140, 872480, -3627]