You will be given a definition of a task first, then some input of the task.
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.

[[-21, -10], [12, 21]]
Output:
[210, 252]