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: [[-9, -42], [47, -41], [-30, 21, -34, 10, -16], [34, -1, 36], [1, 11, 31]]

[378, -1927, -3427200, -1224, 341]