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: [[29, 20, -12, -9], [9, -38, -37, 23], [-31, 34, 6, 34]]

[62640, 291042, -215016]