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: [[-7, 38, -39], [-13, -40], [29, -50, -31, 30]]

[10374, 520, 1348500]