Analyzing changes in unit costs

The costs of materials consumed in producing good units in the Forming Department of Thomas Company were $$7,110$ and $$13,200$ for September and October, respectively. The number of equivalent units produced in September and October was $790$ tons, and $1,650$ 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 $ per ton between September and October.