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: [[-7, 50, -13, 20], [-14, -42, 21, -32], [6, 38, -47], [34, 42], [4, 42]]

[91000, -395136, -10716, 1428, 168]