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: [[5, -28], [-15, -33, -29, 50], [-29, 15, 21, -40]]

[-140, -717750, 365400]