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: [[-15, 38], [9, 50], [5, 3, -13, -15, 46], [12, -6, 7]]

[-570, 450, 134550, -504]