Solution

app/main.py

@@ -1,8 +1,44 @@
 class Car:
-    # write your code here
-    pass
+    def __init__(self, comfort_class: int,
+                 clean_mark: int,
+                 brand: str) -> None:
+        self.comfort_class = comfort_class
+        self.clean_mark = clean_mark
+        self.brand = brand
 
 
 class CarWashStation:
-    # write your code here
-    pass
+    def __init__(self, distance_from_city_center: float,
+                 clean_power: int,
+                 average_rating: float,
+                 count_of_ratings: int) -> None:
+        self.distance_from_city_center = distance_from_city_center
+        self.clean_power = clean_power
+        self.average_rating = average_rating
+        self.count_of_ratings = count_of_ratings
+
+    def serve_cars(self, list_cars: list) -> float:
+        total_cost = 0
+        for car in list_cars:
+            if car.clean_mark < self.clean_power:
+                total_cost += self.calculate_washing_price(car)
+                self.wash_single_car(car)
+        return total_cost
+
+    def calculate_washing_price(self, car: Car) -> float:
+        wash_price = (car.comfort_class
+                      * (self.clean_power - car.clean_mark)
+                      * self.average_rating) / self.distance_from_city_center
+        wash_price = round(wash_price, 1)
+        return wash_price
+
+    def wash_single_car(self, car: Car) -> Car:
+        if self.clean_power > car.clean_mark:
+            car.clean_mark = self.clean_power
+        return car
+
+    def rate_service(self, rating: float) -> float:
+        avg_rating = (self.average_rating * self.count_of_ratings) + rating
+        self.count_of_ratings += 1
+        self.average_rating = round(avg_rating / self.count_of_ratings, 1)
+        return self.average_rating