Find standard deviation for Stock A and Stock B, and which one I should add, Thank you!

You have a portfolio with a standard deviation of 30% and an expected return of 18%. You are considering adding one of the two stocks in the following table. If after adding the stock you will have 25% of your money in the new stock and 75% of your money in your existing portfolio, which one should you add? Standard Deviation Expected Return 12% 12% Correlation with Your Portfolio's Returns 0.4 0.5 Stock A Stock B 22% 17% Standard deviation of the portfolio with stock A is %. (Round to two decimal places.)