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: [[14, -31], [15, 28], [-14, 39, 38, 46, -7], [-10, -38], [27, -18, 21, 28]]

[-434, 420, 6680856, 380, -285768]