Definition: In this task you will be given a list of integers. You should round each integer to the nearest tens place. That means you should round the number to the nearest multiple of 10.
Input: [424, -878, -850, 755, -617, 233, 489, -820, 494, -187, 273, -56, 31, -334, -390]

[420, -880, -850, 760, -620, 230, 490, -820, 490, -190, 270, -60, 30, -330, -390]