Welcome to your interview.
The question is on your right: Cart System with Discounts. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Implement a fully functional cart system with attributes, pricing rules, and discount logic using clean object-oriented design.