Sheffield Corp. has four product lines: sour cream, ice cream, yogurt, and butter. The total cost of producing the milk base for the products is $42000, which has been allocated based on the gallons of milk base used by each product. Results for July follow:

	Sour Cream	Ice Cream	Yogurt	Butter	Total
Units sold	2000	500	400	2000	4900
Revenue	$9350	$18700	$9350	$18700	$56100
Variable departmental costs	5250	11500	3750	4250	24750
Fixed costs	5000	2000	3000	7000	17000
Net income (loss)	$ (900)	$ 5200	$ 2600	$ 7450	$14350

How much are total joint costs of the products?

a. $17000

b. $41750

c. $24750

d. $14350