Answer:
Per additional unit of kystal burger
Step-by-step explanation:
Remember marginal utility is the additional satisfaction derived from consuming more of a product. A rational person (intelligent) may be defined as someone who uses clear thought and reasoning to make decisions.
However, there's a law called the law of diminishing marginal utility which states that at a particular point, Jack's marginal utility from additional consumption of Krystal burger will begin to decrease.