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: [[45, -8, -7, 36], [10, -24], [15, -7, 0, 0], [13, -42], [31, -5, 39]]

[90720, -240, 0, -546, -6045]