Suppose Bella decides to take a trip to Michigan. Which result would be a cost?
A: Bella will give up the chance to go to North Dakota. She would have enjoyed a trip to North Dakota more than Michigan.
B: Bella will save some money. Plane tickets for Bella to get to Michigan are less expensive than tickets to North Dakota.
This result is a cost. It involves giving up or spending something that Bella wants or needs:
Bella will give up the chance to go to North Dakota. She would have enjoyed a trip to North Dakota more than Michigan.