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.
[[4, 15, 5, 42], [-13, 16, -17], [15, 46, 42], [34, -29], [-42, 37, -50], [-12, 3], [45, 31], [20, 29, -37, 7, -25], [-13, 2, -40, -6, 28], [-20, -50]]