Show step by step calculation and please don't use excel formula. Also answer as soon as possible

Question: You are currently only invested in the Natasha Fund (aside from risk-free securities). It has an expected return of 15% with a volatility of 18%. Currently, the risk-free rate of interest is 3.3%. Your broker suggests that you add Hannah Corporation to your portfolio. Hannah Corporation has an expected return of 19%, a volatility of 60%, and a correlation of 0 (zero) with the Natasha Fund. Calculate the required return of Hannah stock. Is your broker right