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: [[-48, 11, -8, -17], [32, -21, 19], [21, 43, -31]]

[-71808, -12768, -27993]