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: [[4, 25, -5, -31], [-1, 5, -24, 5, 31]]

[15500, 18600]