The following data pertain to activity and costs for two recent months:

	October	November
Activity level in units	4,000	11,800
Variable costs	$8,000	?
Fixed costs	31,000	?
Mixed costs	14,500	?
Total costs	$53,500	$124,000

Assuming that these activity levels are within the relevant range, the mixed costs for November were:

	$99,600
	$94,400
	$69,400
	$84,850