You have the following data:

• standard deviation of return on a stock fund (in percent): 34.6%
• standard deviation of return on a bond fund (in percent): 7.3%
• correlation between the returns on the stock and bond fund (decimal value): 0.44
• proportion of the portfolio invested in the stock fund: 0.79

Calculate the standard deviation of return on the portfolio containing this mix of the stock and bond funds.