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, -43, -3, 29], [19, 42, -31], [47, 40]]

[-149640, -24738, 1880]