You put 61% of your money in a stock portfolio that has an expected return of 10% and a standard deviation of 40%. You put the rest of your money in a risky bond portfolio that has an expected return of 3.5% and a standard deviation of 42%. The stock and bond portfolios have a correlation of 0.45. The standard deviation of the resulting portfolio will be ________. Write your answer in percentage format, and round your answer to 2 decimal places.