Definition: 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.
Input: [[21, 9, -50], [39, -30, -31, -36, 10], [16, 38], [18, 10], [-21, 17, 17, 47, 45]]

[-9450, -13057200, 608, 180, -12835935]