If variable cost of goods sold totaled $80,000 for the year (16,000 units at $5.00 each) and the planned variable cost of goods sold totaled $86,250 (15,000 units at $5.75 each), the effect of the quantity factor on the change in contribution margin is:

		$5,000 decrease
		$5,750 decrease
		$5,750 increase
		$5,000 increase