Solution

app/classes/customer.py

@@ -26,4 +26,3 @@ def from_dict(cls_dict: dict) -> Customer:
                 continue
             setattr(new_customer, key, cls_dict[key])
         return new_customer
-

app/classes/shop.py

@@ -21,7 +21,7 @@ def from_dict(cls_dict: dict) -> Shop:
         return new_shop
 
     def print_receipt(self, customer: Customer) -> float:
-        print(f"Date: 04/01/2021 12:33:41")
+        print("Date: 04/01/2021 12:33:41")
         print(f"Thanks, {customer.name}, for your purchase!")
         print("You have bought:")
         total_cost = 0

app/main.py

@@ -1,6 +1,5 @@
 import app.utilities as util
 from app.classes.customer import Customer
-from app.classes.car import Car
 from app.classes.shop import Shop
 
 
@@ -19,10 +18,10 @@ def shop_trip():
         closest_shop = 0
         min_cost = 0
         for index, shop in enumerate(shops):
-            trip_cost = 2 * util.calculate_trip_cost(fuel_price,
-                                                     customer.car.fuel_consumption,
-                                                     customer.location,
-                                                     shop.location)
+            trip_cost = util.calculate_trip_cost(fuel_price,
+                                                 customer.car.fuel_consumption,
+                                                 customer.location,
+                                                 shop.location) * 2
 
             print(f"{customer.name}'s trip to the"
                   f" {shop.name} costs {trip_cost}")