Welcome to your interview.
The question is on your right: Data Structures for Currency Converter. 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.
Explain the logic behind your choice of data structures for the currency converter or similar features.