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.
[[29, -28, -12], [-42, 13, -42, -12, 4], [-30, 41], [-50, -20, -35, 39, 14]]