Describe how a consumer can use a cost-benefit analysis to decide between buying a concert ticket or buying a new pair of jeans. mention the steps involved in analyzing each choice and how this process results in a decision.

Well since cost benefit analysis is process where ones decisions are analyzed for the best result:
I assume depending on the costumers situation
1.Which one is more important
2.Cost
3.Which decision is more beneficial
This process would involve multiple questions depending on the person/consumer
But at the end once all pros and cons are thought the best choice for that particular  consumer would be the final decision.
(hope this helped in some way)