The price of a non$-$dividend paying stock is $$47\mathrm{.}2$ and the price of a six$-$month European call option on the stock with a strike price of $$50$ is $$2.$ The risk$-$free rate is $4\%$ per annum. What is the price of a six$-$month European put option with a strike price of $$50?($Please round your final answer to two decimal places$)$