You invest $10,000 in portfolio XYZ. The portfolio XYZ is composed of a risky asset with an expected rate of return of 15% and a standard deviation of 20% over the one year time period. The risk free asset has a rate of return of 5% over the same time period. How much money should be invested in the risky asset so that the standard deviation of returns on XYZ portfolio is 10% over the one year time horizon