Prove that the return criteria for adding an investment A to an existing portfolio can be represented as R, 2 Roll +Cover 10-12 using the Sharpe Ratio Approach for risk adjusted returns as applied to portfolio decision making. Prove that the return criteria for adding an investment A to an existing portfolio can be represented as R, 2 Roll +Cover 10-12 using the Sharpe Ratio Approach for risk adjusted returns as applied to portfolio decision making