The following bid and ask price and option prices were observed for a stock on May 14 of a particular year. Unless otherwise indicated, ignore dividends on the stock. The stock is priced at 161. The expirations are June 18, and July 16.

1- Using the information in the following table compute the risk-free rate

Maturity	Bid	Ask
06/17	5.95	5.85
07/16	6.1	5.95

Exercise Price	Call Price June	Call Price July	Put Price June	Put Price July
160	10.5	15	10.5	14
165	8.5	12	13.5	17

Check the following combinations of puts and calls and determine whether they conform to the putcall parity rule for European options. If you see any violations, suggest a strategy.

a. June 160

b. July 165