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.
[[48, 26, 5, -49], [-40, -19], [-4, 13], [-7, -10, 4], [-12, -17, 49, 31], [-49, -20, -4, -31]]