Answer:
It would help build your credit score.
Explanation:
Making small purchases and paying off your payments is one of the best way to build your credit score, especially at a young age. If you are at least 18, I would recommend getting a credit card so that when you get older, you will have a good credit score to get loans for a car or even a house.
Why would you need someone to do an narrative for you
Answer: If his plan is going to work.
Explanation: Clearly Jack is using STEM for his plan so making sure that his plan works could possibly be the answer. I mean if you were creating a project you would want to make sure that it works and that you checked your STEM skills to go forward with the plan.