A call option on GM is priced at $12 today, with a maturity 6 months from today and a strike price of $52. The stock price of GM is $51.50 today, and the risk-less rate for 6 months is 2.6% (this is the actual risk-less return for 6 months at which both borrowing and lending is possible). Assuming transactions costs are zero, according to put call parity what should be the price of a put option with 6 months maturity and $52 strike price?