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, -21, 21, 43], [-10, 50, 1], [-6, -19, -10, -28], [14, -10, -49]]

[37926, -500, 31920, 6860]