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: [[42, -28, -40, -10, -7], [-49, 11], [-6, -10, -22], [-29, 46, 47, 42], [-21, -47]]

[3292800, -539, -1320, -2633316, 987]