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

		Total Electricity Costs				Total Machine Hours
January			$2,660				230
February			3,050				330
March			3,520				460
April			4,770				690
May			3,190				420
June			4,960				790
July			4,030				650
August			3,870				590
September			5,040				670
October			4,270				610
November			3,260				330
December			6,720				810

What electricity cost does the cost equation estimate for a level of activity of 790 machine hours?

Electricity costs

$

By what amount does this differ from Junes observed cost for 790 machine hours?

Amount differ

$