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: [[-2, -9, 35, -15], [8, 20, 42, 9, -5], [31, 50, 39, 7, -32]]

[-9450, -302400, -13540800]