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: [[-49, 2], [47, 40], [-40, -46], [-4, -31, -4, -12, 9]]

[-98, 1880, 1840, 53568]