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: [[47, -31, -9], [16, 22, 11], [-1, 5], [49, -25, 2, -5]]

[13113, 3872, -5, 12250]