I need numerical examples and clear explanations.

In March, a US investor instructs a broker to sell one July put option contract on a stock. The current stock price is $46 and the strike price is $45. The option price is $3. Explain what the investor has agreed to. Under what circumstances will the trade prove to be profitable? What are the risks? I found that p ,denoting the stock price in July, is equal to 42 at break even point. So should p be less than 42 or bigger than 42 to be profitable