The following option prices were observed for a stock on July 6 of a particular year. Unless otherwise indicated, ignore dividends on the stock. The stock is priced at 165.13. The expirations are July 17, August 21, and October 16. The risk-free rates are 0.0516, 0.0550, and 0.0588, respectively.

		CALLS				PUTS
STRIKE	JUL	AUG	OCT		JUL	AUG	OCT
155	10.50	11.80	14.00		0.20	1.25	2.75
160	6.00	8.10	11.10		0.75	2.75	4.50
165	2.70	5.20	8.10		2.35	4.70	6.70
170	0.80	3.20	6.00		5.80	7.50	9.00

Check the following combinations of puts and calls and determine whether they conform to the putcall parity rule for American options.

a. July 155

b. August 160

c. October 170