Sheridan Company has four product lines: sour cream, ice cream, yogurt, and butter. The total cost of producing the milk base for the products is $36000, 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	$8330	$16660	$8330	$16660	$49980
Variable departmental costs	3990	8740	2850	3230	18810
Fixed costs	5000	2000	3000	7000	17000
Net income (loss)	$ (660)	$ 5920	$ 2480	$ 6430	$14170

How much are total joint costs of the products?

a)$14170

b)$35810

c)$18810

d) $17000