Solution

app/main.py

@@ -1,8 +1,62 @@
 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, cars: list) -> float:
+
+        price = 0.0
+
+        for car in cars:
+
+            if car.clean_mark < self.clean_power:
+
+                car_income = self.calculate_washing_price(car)
+                price += car_income
+                car.clean_mark = self.wash_single_car()
+
+        return round(price, 1)
+
+    def calculate_washing_price(self, car: Car) -> float:
+
+        clean_diff = self.clean_power - car.clean_mark
+        car_income = (
+            car.comfort_class * clean_diff * self.average_rating
+        ) / self.distance_from_city_center
+        return round(car_income, 1)
+
+    def wash_single_car(self) -> int:
+
+        return self.clean_power
+
+    def rate_service(self, single_rate: float) -> None:
+
+        new_rating = round(
+            (self.average_rating * self.count_of_ratings + single_rate)
+            / (self.count_of_ratings + 1),
+            1,
+        )
+        self.count_of_ratings += 1
+        self.average_rating = new_rating