You put half of your money in a stock portfolio that has an expected return of 14% and a standard deviation of 25%. You put the rest of your money in a risky bond portfolio that has an expected return of 6% and a standard deviation of 10%. If the stock and bond have a correlation of 0.5, the portfolio's standard deviation is % ? Please keep 2 decimal places, for example 12.34, not 0.012