A stock has returns that follows a normal distribution $($bell curve$).$ The average $($or expected$)$ return is $18\%$ and the standard deviation of returns is $18\%.$ Using the approximation rule shown in class, what is the probability that this stock's return is above $0\%$ but below $36\%?$ Enter your answer as a $\%($do not enter a $\%$ symbol or any other punctuation$).$