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: [[31, -17, 14, -49], [-10, -10, -8], [-7, -31, -37, -34]]

[361522, -800, 272986]