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.
[[-25, -1, 8], [48, -4], [46, 9], [28, 25], [-48, 45, -23, -31]]