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: [[6, -7], [40, -18, 23, -40], [6, -20], [1, 2, -48]]

[-42, 662400, -120, -96]