Final answer:
Based on the given information, it is not possible to determine the standard portion cost for a steak platter.
Step-by-step explanation:
The question asks for the standard portion cost for a steak platter based on exhibits 5 and 6. Unfortunately, there is no clear mention of exhibits 5 and 6 in the provided information. Therefore, without the specific information from those exhibits, it is not possible to determine the standard portion cost for a steak platter.