solution

app/main.py

@@ -1,8 +1,54 @@
+from typing import List
+
+
 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[Car]) -> float:
+        income = 0.0
+        for car in cars:
+            if car.clean_mark < self.clean_power:
+                wash_cost = self.calculate_washing_price(car)
+                income += wash_cost
+                self.wash_single_car(car)
+        return round(income, 1)
+
+    def calculate_washing_price(self, car: Car) -> float:
+        return round(
+            (car.comfort_class * (self.clean_power - car.clean_mark)
+             * self.average_rating) / self.distance_from_city_center,
+            1
+        )
+
+    def wash_single_car(self, car: Car) -> None:
+        if car.clean_mark < self.clean_power:
+            car.clean_mark = self.clean_power
+
+    def rate_service(self, new_rating: int) -> None:
+        total_rating = self.average_rating * self.count_of_ratings
+        total_rating = (
+            total_rating
+            + new_rating
+        )
+        self.count_of_ratings += 1
+        self.average_rating = round(
+            total_rating / self.count_of_ratings, 1
+        )