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: [[-31, 10, -49, 13, -21], [47, -9, 25, -31], [-19, 41, -46], [47, -17]]

[-4146870, 327825, 35834, -799]