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: [[-14, 23], [45, -32, 40], [-13, 45], [49, 31, -42]]

[-322, -57600, -585, -63798]