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: [[38, 7, 34, 10], [-40, -8, -16, 7], [31, 25, -9, -41], [43, -10, -15]]

[90440, -35840, 285975, 6450]