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: [[41, -44, 46, -36], [-43, 21], [-30, -13, 29], [-45, 40, -50, 31]]

[2987424, -903, 11310, 2790000]