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.
[[13, 46, -31, 10], [-30, 39, -4, -9], [32, 8, -33], [42, 30, -22, 12]]