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: [[6, -23], [1, -2, 18, -8], [12, 28, -1]]

[-138, 288, -336]