Solution

app/main.py

@@ -1,8 +1,54 @@
 class Car:
-    # write your code here
-    pass
-
+    def __init__(self, comfort_class, clean_mark, brand):
+        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, clean_power, average_rating, count_of_ratings):
+        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):
+        total_income = 0
+        for car in cars:
+            if car.clean_mark < self.clean_power:
+                total_income += self.calculate_washing_price(car)
+                car.clean_mark = self.clean_power
+        return round(total_income, 1)
+
+    def calculate_washing_price(self, car):
+        price = (car.comfort_class * (self.clean_power - car.clean_mark) *
+                 self.average_rating) / self.distance_from_city_center
+        return round(price, 1)
+
+    def wash_single_car(self, car):
+        if car.clean_mark < self.clean_power:
+            car.clean_mark = self.clean_power
+
+    def rate_service(self, rating):
+        self.count_of_ratings += 1
+        self.average_rating = round(((self.average_rating * (self.count_of_ratings - 1)) + rating) / self.count_of_ratings, 1)
+
+
+
+bmw = Car(comfort_class=3, clean_mark=3, brand='BMW')
+audi = Car(comfort_class=4, clean_mark=9, brand='Audi')
+
+print(bmw.clean_mark)  
+
+
+wash_station = CarWashStation(
+    distance_from_city_center=5,
+    clean_power=6,
+    average_rating=3.5,
+    count_of_ratings=6
+)
+
+
+income = wash_station.serve_cars([bmw, audi])
+print(income)  # 6.3
+print(bmw.clean_mark)  # 6
+