Answer and Explanation:
The act performed by the treasurer of holding the check for 4 days and blaming it to the mail room is unethical as it violates the basic principle of integrity- having honest business practice. Also such a practice of suppressing the discount period due to their large size operation results i "abuse of dominant position", which means owning to their large size, they are able to dictate the terms of the agreement as per their wish rather than following the norm.
The small creditors are getting harmed in this case, who are offering discount for early payments ,but not receiving it on time. The company is getting benefit d by unfair means as they are able to get discount on their bills and also earn 4 days interest at the same time.
The new treasurer should put an end to such practices and pay bills on time , if there is a delay in payment , should not take advantage of the facility.