Suppose you have some money invested in corporate bonds. This portfolio's expected return is 10%, and the standard deviation of returns is 12% Your financial adviser recommends moving that money into an index fund that closely tracks the S&P 500 index. The Index has an expected return of 12.5%, and its standard deviation is 14%. Can you create a combination of the index fund and Treasury bills, that will increase your expected rate of return without changing the risk of the portfolio? Assume Treasury bills yield 4% 73.5 invested in the index fund and the remainder in Treasury bills 85.7% invested in the index fund and the remainder in Treasury bills 70.6 invested in the index fund and the remainder in Treasury bills 76.15 invested in the index fund and the remainder in Treasury bills 79.6 invested in the index fund and the remainder in Treasury bills