🛒 Product Catalogue & Discount Calculation Program

This program simulates a basic checkout system with a product catalogue and a set of discount rules. It prompts the user for product quantities and gift wrapping options, then calculates the total cost with the most beneficial discount applied.

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📦 Product Catalogue

Product	Price
Product A	$20
Product B	$40
Product C	$50

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🎁 Discount Rules

Only one discount can be applied per purchase — the one that offers the maximum savings.

1. flat_10_discount
   → Applies a flat $10 discount if the cart total exceeds $200.

2. bulk_5_discount
   → Applies a 5% discount on a product’s total if more than 10 units of that product are purchased.

3. bulk_10_discount
   → Applies a 10% discount on the entire cart if total quantity across all products exceeds 20 units.

4. tiered_50_discount
   → Applies a 50% discount on units beyond 15 of any product if total quantity exceeds 30 units.

   • First 15 units are charged at full price.
   • Remaining units (above 15) of that product get a 50% discount.

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💡 How It Works

1. User inputs:

   • Quantity for each product.
   • Whether each product is gift-wrapped.

2. Output displayed:

   • Each product’s name, quantity, and total cost.
   • Cart subtotal.
   • Best applicable discount name and discount amount.
   • Final total payable after discount.

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