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: [[-50, 7], [16, -25], [13, 13, 34, 1, -44], [-31, -13]]

[-350, -400, -252824, 403]