Final answer:
An attorney can enter into a business transaction with a client if it is fair and reasonable to the client and with their informed consent. However, entering into a business transaction adverse to the client's interests requires the client's informed consent.
Step-by-step explanation:
An attorney may enter into a business transaction with a client if it is fair and reasonable to the client and if the attorney fully discloses the terms of the transaction and obtains the client's informed consent. However, an attorney cannot enter into a business transaction that is adverse to the client's interests without the client's informed consent. This is to ensure that the attorney does not have a conflict of interest and can provide unbiased advice and representation.