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: [[-34, -50], [-12, 31, 13], [-48, -3, -31, 3]]

[1700, -4836, -13392]