ElectroTechCompany produces handheld calculators. The company controller wanted to calculate the fixed and variable costs associated with the maintenance cost incurred by the factory. Data for the past four months were collected as follows:

Month	Maintenance Cost	Machine Hours
June	$5,000	350
July	3,000	320
August	4,000	315
September	3,300	220

Coefficients shown by a regression program are as follows:

Intercept	1,000
X Variable 1	8.5

Using the results of regression, calculate the variable rate of maintenance cost.