19 Porter Investments needs to develop an investment portfolio for Mrs. Singh from the following list of possible investments:

INVESTMENT COST EXPECTED RETURN A $ 10,000 $ 700 B $ 12,000 $ 1,000 C $ 3,500 $ 390 D $ 5,000 $ 500 E $ 8,500 $ 750 F $ 8,000 $ 640 G $ 4,000 $ 300 Mrs. Singh has a total of $60,000 to invest. The following conditions must be met: (1) If investment F is chosen, then investment G must also be part of the portfolio, (2) at least four investments should be chosen, and (3) of investment A and B, exactly one must be included. What stocks should be included in Mrs. Singh’s portfolio?