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: [[23, 39, -45], [-13, 18, -48, 39], [21, -32], [21, 15, 4]]

[-40365, 438048, -672, 1260]