Actors and Use Cases Explained

Actors:

1. User (Primary) – Initiates the process to calculate the car price.
2. System (Implicit) – Executes the calculations and displays the output.
3. (Optional) Finance API / Tax API – External systems for EMI or tax rate information.

Use Cases:

• Input Base Price – The user enters the base price of the car.
• Select Car Model – The user selects a car model or variant.
• Choose Add-ons/Features – The user picks optional extras like sunroof, leather seats, etc.
• Calculate Total Price – The system processes all inputs and performs price calculation.
• Apply Taxes & Fees – The system includes tax, insurance, and registration fees.
• Display Final Price – The system shows the full cost to the user.
• Optionally Calculate EMI – If available, the system computes monthly installments based on loan inputs.