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, -46, 28, -1, -7], [-25, -13, 39], [-42, -36], [17, 12, -20], [-44, 15, 15, 3]]

[-279496, 12675, 1512, -4080, -29700]