The costs of materials consumed in producing good units in the Forming Department of Thomas Company were $6,000 and $9,780 for September and October, respectively. The number of equivalent units produced in September and October was 750 tons, and 1,630 tons, respectively. Evaluate the change in the cost of materials between the two months.

Round all answers to the nearest whole cent.

Energy cost per ton, September	$
Energy cost per ton, October	$

The cost of energy has appeared to _______________ by $fill in the blank 4 per ton between September and October.