solution

app/main.py

@@ -1,8 +1,37 @@
 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: int, clean_power: int,
+                 average_rating: int, 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 calculate_washing_price(self, car: Car) -> None:
+        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 serve_cars(self, cars: Car) -> None:
+        income = 0
+        for car in cars:
+            if car.clean_mark < self.clean_power:
+                income += self.calculate_washing_price(car)
+                self.wash_single_car(car)
+        return round(income, 1)
+
+    def rate_service(self, rating: int) -> None:
+        total_rating = (self.average_rating * self.count_of_ratings) + rating
+        self.count_of_ratings += 1
+        self.average_rating = round(total_rating / self.count_of_ratings, 1)