The controller of Carla Vista Production has collected the following monthly expense data for analyzing the cost behavior of electricity costs.

		Total Electricity Costs				Total Machine Hours
January			$2,450				270
February			3,100				320
March			3,570				450
April			4,700				685
May			3,240				400
June			4,870				800
July			4,120				650
August			3,950				580
September			5,020				670
October			4,260				630
November			3,250				320
December			6,300				820

(a)

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Determine the fixed- and variable-cost components using the high-low method.

Fixed-costs		$enter the fixed cost amount in dollars
Variable-costs		$enter the variable cost amount in dollars

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(b)

What electricity cost does the cost equation estimate for a level of activity of 450 machine hours?

Electricity costs

$enter the electricity cost amount in dollars

By what amount does this differ from Marchs observed cost for 450 machine hours?

Amount differ

$enter the difference cost amount in dollars

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(c)