. Your investment portfolio comprises of 250 shares of Cisco Systems, Inc. and 300 shares of Exxon Mobil Co., which you bought a year ago at $381 per share and $99 per share, respectively. If Cisco Systems, Inc.s share price has changed to $374, and Exxon Mobil Co.s share price has changed to $101, and assume no dividends have been given, then what is the return of your portfolio? use equations only