A department of Alpha Co. incurred the following costs for the month of September. Variable costs, and the variable portion of mixed costs, are a function of the number of units of activity:

Activity level in units		6,000
Variable costs	$	13,200
Fixed costs		29,000
Mixed costs		18,440
Total costs	$	60,640

During October, the activity level was 8,800 units, and the total costs incurred were $68,500. Required: a. Calculate the variable costs, fixed costs, and mixed costs incurred during October.

Answer is complete and correct.

	October
Variable cost	$19,360 selected answer correct
Fixed cost	$29,000 selected answer correct
Mixed cost	$20,140 selected answer correct

b. Use the highlow method to calculate the cost formula for mixed cost. (Do not round intermediate calculations and round your answers to 2 decimal places.)

Answer is complete but not entirely correct.

Cost formula

$14,772.00 selected answer incorrect

+

$0.61 selected answer correct

per unit

I cant figure out the first part of b.