4. (Portfolio expected rate of return) Barry Swifter is 60 years of age and considering retirement. Barry's retirement portfolio currently is valued at $750,000 and is allocated in Treasury bills. an S\&P 500 indax find and an amaninn makno bind an follows: a. Based on the current portfolio composition and the expected rates of return given above, what is the expected rate of return for Barry's portfolio? b. Barry is considering a reallocation of his investments to include more Treasury bills and less exposure to emerging markets. If Barry moves all of his money from the emerging market fund and puts it Treasury bills, what will be the expected rate of return on the resulting portfolio