Inc. recorded the following data for operations during six months of the fiscal year:

	Overhead Cost	Labour hours
January	$601,600	34,680
February	565,000	24,960
March	589,000	27,560
April	635,000	38,960
May	593,250	29,200
June	624,000	36,040

Required

1. Using the high-low method, compute the variable rate for overhead per labour hour.
2. Using the high-low method, compute the fixed cost.
3. What is the cost formula?
4. Using the cost formula from (C), estimate the overhead cost for 42,800 labour hours.