Coin Quest: The Coin Shop

🪙 The shop is open! A coin pack costs 4 dollars, and you're buying 3 packs with 20 dollars in your pocket.

1. Create packs with 3
2. Compute price as 4 * packs
3. Compute money as 20 - price
4. Print the receipt with an f-string: You bought 3 packs for 12 dollars
5. Print money on its own line