Matthew owns a machine shop. In reviewing the$$ shop's utility bills for the past $12$ months, he found that the highest bill of $ $2$ comma $600$ occurred in August when the machines worked $1$ comma $400$ machine hours. The lowest utility bill of $ $2$ comma $300$ occurred in December when the machines worked $900$ machine hours.

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Part $1$

Requirement $1.$ Use the$$ high$-$low method to calculate the variable cost per machine hour and the total fixed utility cost.

$$First$,$ calculate the variable cost per machine hour. Select the formula$$ labels, then enter the amounts and compute the variable cost per machine hour. $($Use the$$ high$-$low method. Round your answer to the nearest$$ cent.$)$

Part $2$

Change in total costs

$-$:

Change in volume of activity

$=$

Variable cost per machine hour

$-$:

$=$