Code review us-medical-insurance-cost. Can my code be more lean?

Hi all,
My name is Willem and i did the us-medical-portfolio assignment. I would love some feedback on how to tackle this in a different way. I also peeked at the solution tab, where it used class where it brought all the functions under. Although i kind of understood this, this was not something that we had until now in the course, so i chose not to use this.

Looking forward to your feedback.

kind regards,

Willem