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: [[-40, -32, -4], [-35, 50, -21, 35, 21], [47, 37, -10], [11, -40, -31]]

[-5120, 27011250, -17390, 13640]